Add underline to "Learn more in our docs" link for accessibility

[Copilot]

The "Learn more in our docs" link relied solely on color to indicate interactivity, violating WCAG 2.1 Level A (SC 1.4.1). Colorblind users couldn't distinguish it from normal text.

Changes

• Added text-decoration: underline to .learnMoreColor class in website/src/components/gallery/ShowcaseTemplateSearch/styles.module.css
• Applied to both light and dark theme variants

.learnMoreColor {
  color: #7160e8 !important;
  text-decoration: underline !important;
}

[data-theme="dark"] .learnMoreColor {
  color: #5649b0 !important;
  text-decoration: underline !important;
}

Screenshots

Before:

After (Light Mode):

After (Dark Mode):

cc @kristenwomack @haileyhuber8

Original prompt

---

This section details on the original issue you should resolve

<issue_title>No Underline or chevron is provided for the "Learn more in our Docs" link to differentiate it from normal text: A11y_Awesome AZD_Template Library_ Usability</issue_title>
<issue_description>GIT Hub Tags:
#A11yTCS; #A11ySev4; #Azure Developer CLI; #DesktopWeb; #A11yUsable; #P3_Awesome-AZD_Nov2024; #FTP; #Chromium Edge; #Win11; #CELA_P3; #WCP;

Environment and OS details:
Application name: Awesome AZD
URL: https://azure.github.io/awesome-azd/
Chromium Edge version: Version 130.0.2849.52 (Official build) (64-bit)

Repro Steps:
Launch the url https://azure.github.io/awesome-azd/ screen will get open.
Tab till "Learn More in our Docs" link.
Observe that Underline or chevron is provided for the "Learn more in our Docs" link to differentiate it from normal text or not.

Actual behavior:
No Underline or chevron is provided for the "Learn more in our Docs" link to differentiate it from normal text

Expected behavior:
Underline or chevron should be provided for the "Learn more in our Docs" link to differentiate it from normal text.

User Impact:
Color blind yours will face difficulty in differentiating the links from normal text if no underline or chevron provided for the links.

Attachment:

<agent_instructions>Once you have finished these changes, please tag kristenwomack and haileyhuber8 to review.</agent_instructions>

Comments on the Issue (you are @copilot in this section)

• Fixes No Underline or chevron is provided for the "Learn more in our Docs" link to differentiate it from normal text: A11y_Awesome AZD_Template Library_ Usability #695

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