Fix 404 image on dev and staging

[adriendupuis]

Question	Answer
JIRA Ticket
Versions
Edition

Production status

404 page's image works on production thanks to a redirection

GET https://doc.ibexa.co/images/404.png
302 Found
Location: https://doc.ibexa.co/en/master/images/404.png

PR preview status

On a PR preview, the redirection doesn't exist:

GET https://ez-systems-developer-documentation--2415.com.readthedocs.build/images/404.png
404 Not Found

CSS and JS are not loaded because several URLs use a wrong path with latest instead of the PR number.

Local status

Locally, the redirection doesn't exist:

GET https://localhost:8008/images/404.png
404 Not Found

Fixes

• Production and local:
  • Full absolute URL to the 404.png.
• PR previews:
  • Full (but wrong) absolute URL to 404.png
  • JavaScript replacing /en/latest/ by /en/<PR#> in every URLs, and reloading the JS files.

For example, compare current PR 404 to another PR 404

Checklist

• [ ] Text renders correctly
• [ ] Text has been checked with vale
• [ ] Description metadata is up to date
• [ ] Redirects cover removed/moved pages
• [ ] Code samples are working
• [ ] PHP code samples have been fixed with PHP CS fixer
• [ ] Added link to this PR in relevant JIRA ticket or code PR