Add theme context and provider for dark/light mode support

- Introduced a new  enum to manage UI themes (Light, Dark, System).
- Implemented  component to provide theme context to child components.
- Added functionality to update CSS based on the selected theme and system preferences.
- Integrated local storage to persist theme selection across sessions.
- Updated  to include the new context module.
- Modified the  page to include buttons for learning and joining the community.
- Added new icon modules for Rust logos.

Author: Phosphorus-M

.env

@@ -0,0 +1 @@
+LEPTOS_TAILWIND_VERSION=v4.1.14

.vscode/settings.json

@@ -1,19 +1,20 @@
 {
-    "emmet.includeLanguages": {
-        "rust": "html",
-        "*.rs": "html"
-      },
-      "tailwindCSS.includeLanguages": {
-          "rust": "html",
-          "*.rs": "html"
-      },
-      "files.associations": {
-          "*.rs": "rust"
-      },
-      "editor.quickSuggestions": {
-        "other": "on",
-        "comments": "on",
-        "strings": true
-      },
-      "css.validate": false,
+  "emmet.includeLanguages": {
+    "rust": "html",
+    "*.rs": "html"
+  },
+  "tailwindCSS.includeLanguages": {
+      "rust": "html",
+      "*.rs": "html"
+  },
+  "files.associations": {
+      "*.rs": "rust"
+  },
+  "editor.quickSuggestions": {
+    "other": "on",
+    "comments": "on",
+    "strings": true
+  },
+  "css.validate": false,
+  "rust-analyzer.cargo.features": ["ssr", "development", "hydrate"],
 }