Default Symfony stylesheet and js files missing

[robfrawley]

The default Symfony documentation stylesheet https://symfony.com/css/compiled/v5/all.css?v=4 and js https://symfony.com/js/v5/all.js?v=4 files are no longer valid URLs; it looks like the new live Symfony documentation uses compiled stylesheet/js files, likely the result of webkitor encore.

While this is fine for the main website, we still need a consistent URL to point to for documentation PRs, as well as for local builds of documentation, including external projects that rely on this documentation (for example, local testing of the liip/imagine-bundle documentation now has no styling or javascript). Regarding this repository, all the current PRs show unstyled HTML on their platform.sh builds.

First, we need a static location for the compiled stylesheets and js to be exposed from the new build system, and then the lines that require updates in this repository are in _build/_theme/_templates/layout.html, specifically line 3 and line 10.

[snoek09]

duplicate of related to #9246

[robfrawley]

Not a duplicate of #9246, which focuses on updating the theme. This issue is the result of Symfony removing the default theme the documentation points to when built locally, something that existed for years and was only removed in recent months when design changes were pushed live on the Symfony documentation website (such as using encore/webkit).

The change reported here breaks all styling of pull request builds, as well as all the styling when building locally, which specifically breaks local testing when submitting PRs here, as well as projects that rely on the Symfony documentation for their own, such as imagine-bundle, including our wiki article on locally testing documentation changes.

[snoek09]

My bad, I rephrased it.

[javiereguiluz]

This was fixed by #9517. If the error persist, please reopen and provide more details about the error (screenshots, error messages, URLs of CSS/JS files that can't be loaded, etc.) Thanks!