fix: bump hugo theme to 0.35.0

[Jcahilltorre]

Proposed changes

• Bump the Hugo theme to 0.35.0
• Hugo config changes to update the code highlight colors (fixing some accessibility issues).

Checklist

Before creating a PR, run through this checklist and mark each as complete.

• I have read the CONTRIBUTING doc
• I have added tests that prove my fix is effective or that my feature works
• I have checked that all unit tests pass after adding my changes
• I have updated necessary documentation
• I have rebased my branch onto main
• I will ensure my PR is targeting the main branch and pulling from my branch from my own fork

[github-actions]

Dependency Review

✅ No vulnerabilities or license issues found.

Scanned Manifest Files

docs/go.mod

• github.com/nginxinc/nginx-hugo-theme@0.35.0
• github.com/nginxinc/nginx-hugo-theme@0.34.0

[codecov]

Codecov Report

Merging #4225 (f82b88d) into main (b8aaeea) will increase coverage by 0.01%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main    #4225      +/-   ##
==========================================
+ Coverage   51.95%   51.96%   +0.01%     
==========================================
  Files          59       59              
  Lines       16759    16759              
==========================================
+ Hits         8707     8709       +2     
  Misses       7753     7753              
+ Partials      299      297       -2     

see 2 files with indirect coverage changes

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[lucacome]

@Jcahilltorre I've added automation to bump the version automatically like in #4224 can you take a look? 🙏