Fix navigation bar anchor links

[Copilot]

Navigation links were broken due to URL/anchor ID mismatches. URLs contained extraneous dashes (/#-publications) while anchor IDs did not (#publications). Additionally, three sections lacked anchor elements entirely.

Changes

• _data/navigation.yml: Removed dashes from fragment identifiers

  • /#-publications → /#publications
  • /#-educations → /#educations
  • /#-internships → /#internships

• _pages/about.md: Added missing anchor elements before section headers

  <span class='anchor' id='publications'></span>
  <span class='anchor' id='educations'></span>
  <span class='anchor' id='internships'></span>

• .gitignore: Excluded vendor/ and .bundle/ directories

The navigation now renders: Homepage (hardcoded in masthead) → About Me → Publications → Educations → Internships, with all links properly resolving to their corresponding page sections.

Original prompt

The user wants to fix the navigation bar on their academic homepage.
Currently, it shows: Homepage, About Me, News, Publications, Honors and Awards, Educations, Invited Talks, Internships.
The user wants it to show ONLY:

1. Homepage (Keep this as hardcoded in masthead.html)
2. About Me (Link to #about-me)
3. Publications (Link to #publications)
4. Educations (Link to #educations)
5. Internships (Link to #internships)

Tasks:

1. Update _data/navigation.yml to contain only "About Me", "Publications", "Educations", and "Internships" with correct URLs (remove the extra '-' in '/#-publications' etc.).
2. Update _pages/about.md to ensure headers for Publications, Educations, and Internships have corresponding HTML anchors or consistent IDs that match the navigation links. For example, add <span class='anchor' id='publications'></span> before the Publications header.
3. Ensure "Homepage" remains in _includes/masthead.html but the loop for other items works correctly.

The current _data/navigation.yml seems to have some of these changes but the user reports it's not working (likely due to URL mismatches or deployment delay). I will force the correct state.

Current image of the problem:

This pull request was created from Copilot chat.

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