feat: add storybook implementation for ToC component

demo/src/Components/Toc/data.ts

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+import singlePageSettings from './single-page-toc-items.json';
+import pageSettings from './page-toc-items.json';
+
+export const getTocItems = (singlePage = false) => {
+    return singlePage ? singlePageSettings : pageSettings;
+};

demo/src/Components/Toc/index.scss

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+@import '@diplodoc/components';
+@import '@diplodoc/components/themes/common';

demo/src/Components/Toc/index.stories.tsx

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+import React, {useEffect, useState} from 'react';
+import {Toc as Component, LabelProps, TocItem, TocLabel} from '@diplodoc/components';
+import cn from 'bem-cn-lite';
+
+import {getTocItems} from './data';
+import './index.scss';
+
+const layoutBlock = cn('Layout');
+
+type Args = {
+    Title: string;
+    TocTitleIcon: string;
+    HideTocHeader: boolean;
+    SinglePage: boolean;
+    PdfLink: string;
+    LabelTitle: string;
+    LabelDescription: string;
+    LabelTheme: LabelProps['theme'];
+};
+
+const useSinglePage = (value: boolean) => {
+    const [singlePage, onChangeSinglePage] = useState(value);
+
+    return {
+        singlePage,
+        onChangeSinglePage,
+    };
+};
+
+const TocDemo = (args: Args) => {
+    const {
+        ['Title']: currentTitle,
+        ['TocTitleIcon']: currentTocTitleIcon,
+        ['HideTocHeader']: currentHideTocHeader,
+        ['PdfLink']: currentPdfLink,
+        ['SinglePage']: currentSinglePage,
+        ['LabelTitle']: currentLalbelTitle,
+        ['LabelDescription']: currentLabelDescription,
+        ['LabelTheme']: currentLabelTheme,
+    } = args;
+    const {singlePage, onChangeSinglePage} = useSinglePage(currentSinglePage);
+
+    const router = {pathname: '/docs'};
+    const label: TocLabel = {
+        title: currentLalbelTitle,
+        description: currentLabelDescription,
+        theme: currentLabelTheme,
+    };
+    const items: TocItem[] = getTocItems(singlePage);
+
+    useEffect(() => {
+        onChangeSinglePage(currentSinglePage);
+    }, [currentSinglePage, onChangeSinglePage]);
+
+    return (
+        <div className={layoutBlock('content')}>
+            <Component
+                items={items}
+                singlePage={singlePage}
+                onChangeSinglePage={onChangeSinglePage}
+                hideTocHeader={currentHideTocHeader}
+                tocTitleIcon={currentTocTitleIcon}
+                pdfLink={currentPdfLink}
+                title={currentTitle}
+                router={router}
+                label={label}
+            />
+        </div>
+    );
+};
+
+export default {
+    title: 'Components/ToC',
+    component: TocDemo,
+    argTypes: {
+        Title: {
+            control: 'text',
+        },
+        TocTitleIcon: {
+            control: 'text',
+        },
+        LabelTitle: {
+            control: 'text',
+        },
+        LabelDescription: {
+            control: 'text',
+        },
+        LabelTheme: {
+            control: 'select',
+            options: [
+                'info',
+                'normal',
+                'danger',
+                'warning',
+                'success',
+                'utility',
+                'unknown',
+                'clear',
+            ],
+        },
+        HideTocHeader: {
+            control: 'boolean',
+        },
+        SinglePage: {
+            control: 'boolean',
+        },
+        PdfLink: {
+            control: 'text',
+        },
+    },
+};
+
+export const ToC = {
+    args: {
+        Title: 'Table of Contents',
+        TocTitleIcon: '📑',
+        LabelTitle: 'NEW',
+        LabelDescription: 'You can select another theme for the label',
+        LabelTheme: 'info',
+        HideTocHeader: false,
+        SinglePage: false,
+        PdfLink: 'https://doc.yandex-team.ru/help/diy/diy-guide.pdf',
+    },
+};

demo/src/Components/Toc/page-toc-items.json

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+[
+  {
+    "name": "Overview",
+    "href": "#overview",
+    "id": "e791c8fa03abd01b0a544fc7235022f7"
+  },
+  {
+    "name": "Quick start",
+    "href": "#quick-start",
+    "id": "ed2bdc3c40406eceb65d4e3b6323a16c"
+  },
+  {
+    "name": "Yandex Flavored Markdown",
+    "expanded": false,
+    "href": "#markdown",
+    "items": [
+      {
+        "name": "Syntax",
+        "items": [
+          {
+            "name": "Overview",
+            "href": "#syntax-overview",
+            "id": "cc3cd8ce896a9178d638c1dbf8129f11"
+          },
+          {
+            "name": "Basic markup",
+            "href": "#basic-markup",
+            "id": "b637ef82e97958680314533737b36e57"
+          },
+          {
+            "name": "Lists",
+            "href": "#lists",
+            "id": "3b02d2eff25874e2eb1e39518dadcedc"
+          },
+          {
+            "name": "Tables",
+            "items": [
+              {
+                "name": "GFM Tables",
+                "href": "#tables",
+                "id": "8f0ddfba89070063f0c69a44dedfca1c"
+              },
+              {
+                "name": "Multiline tables",
+                "href": "#multi-tables",
+                "id": "4eeeb77ed9353b9679b245af8194ff43"
+              }
+            ],
+            "id": "4fea9780e4fd08a1c6bfc5707b4c7f01"
+          },
+          {
+            "name": "Notes",
+            "href": "#notes",
+            "id": "18e6a43134b0088a6f1edd56a3c1b011"
+          }
+        ],
+        "id": "35a4c4af382fbf3b93bd7f3575492e64"
+      },
+      {
+        "name": "Settings",
+        "href": "#settings",
+        "id": "2d73aa064983e9c736de14bc4db066d7"
+      }
+    ],
+    "id": "0306901f3d63c90a53cc752d61ddbce5"
+  },
+  {
+    "name": "Contents",
+    "href": "#contents",
+    "id": "23ff2a1c8fdff8655b93f890e2436a26"
+  },
+  {
+    "name": "Leading page",
+    "href": "#leading-page",
+    "id": "7d533f3687cba23f1f560e8ee749c50c"
+  },
+  {
+    "name": "Page constructor",
+    "items": [
+      {
+        "name": "Overview",
+        "href": "#page-constructor",
+        "id": "aa9dc8105b533c9e78a088a55d105659"
+      },
+      {
+        "name": "Example 1",
+        "href": "#pc-example1",
+        "id": "74e29f97951dea8e3c14c00923e06a45"
+      },
+      {
+        "name": "Example 2",
+        "href": "#pc-example2",
+        "id": "42c45ce086d9fd7c5f359bc7e1d62d81"
+      },
+      {
+        "name": "Example 3 (fullScreen mode)",
+        "href": "#pc-example3",
+        "id": "91eb10b0f3da39a6ba9425da6fb831ff"
+      }
+    ],
+    "id": "0c87cd89568340c52388093d1055739a"
+  },
+  {
+    "name": "Variable presets",
+    "href": "#presets",
+    "id": "71300809e72bfdbfd4f7f97dd8695dec"
+  },
+  {
+    "name": "Configuration file",
+    "href": "#config",
+    "id": "b3b47b30afa8e07763e63ab90841780b"
+  },
+  {
+    "name": "Reusing content",
+    "href": "#includes",
+    "id": "019aeaf91f8f7ca71382b94d36c3d443"
+  },
+  {
+    "name": "Linter configuration file",
+    "href": "#lint",
+    "id": "c1683a4a7bf4514648de2c6a989b7398"
+  }
+]

demo/src/Components/Toc/single-page-toc-items.json

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+[
+  {
+    "name": "Overview",
+    "href": "#overview",
+    "id": "e791c8fa03abd01b0a544fc7235022f7"
+  },
+  {
+    "name": "Quick start",
+    "href": "#quick-start",
+    "id": "ed2bdc3c40406eceb65d4e3b6323a16c"
+  },
+  {
+    "name": "Contents",
+    "href": "#contents",
+    "id": "23ff2a1c8fdff8655b93f890e2436a26"
+  },
+  {
+    "name": "Leading page",
+    "href": "#leading-page",
+    "id": "7d533f3687cba23f1f560e8ee749c50c"
+  }
+]