LF-3921d Fix nginx 'rewrite or internal redirection cycle while internally redirecting to "/index.html"' error

[kathyavini]

Description

Follow-up to two Previous PRs:

• LF-3921a Update Nginx configuration to match vite-pwa recommendations #3027
• LF-3921c Remove reference to file-specific locations in nginx server block #3029

After the most recent PR, Nginx began crashing with the error rewrite or internal redirection cycle while internally redirecting to "/index.html". It's not a very rare error, and I saw two listed solutions for fixing it: This Stack Overflow suggests adding a 404 to the try_files, which would indeed fix the redirect cycle, but I think I will start with restoring a dedicated location block for /index.html as described in this StackExchange thread with the hope of getting a more helpful error out of it.

The 404 (and the issues from the first PR linked above) were caused by the lost root directive in the / location block, because I was following the vite-pwa sample code, where it was not listed, presumably because it would be assumed to be set under the server block, while we had been setting it in each location individually.

This caused the 404 loop on index.html and the errors (missing translations, inability to find the webmanifest and service worker file) from the first PR.

Jira link: https://lite-farm.atlassian.net/browse/LF-3921

Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update

How Has This Been Tested?

• Passes test case
• UI components visually reviewed on desktop view
• UI components visually reviewed on mobile view
• Other (please explain)

Got pretty frustrated with testing on merge so started testing with the the local-docker branch I had made a while ago to test something else. It did repro the internal sever error and the fix resolved it.

Checklist:

• I have commented my code, particularly in hard-to-understand areas
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• The precommit and linting ran successfully
• I have added or updated language tags for text that's part of the UI
• I have added "MISSING" for all new language tags to languages I don't speak
• I have added the GNU General Public License to all new files