Show readonly code editor field on detail page

[Uplink03]

This patch adds a read-only CodeMirror for CodeEditorField on the detail page.

Assets rebuilt with make build-assets.

Problems with this PR

@javiereguiluz I need some help, if you don't mind.

Unfortunately, I can't get good results from yarn build, so this PR is a draft until I figure that out. The patch works even without a rebuild, but a build is necessary to make the CodeMirror editor read-only.

When I run yarn build, the following problems occur:

• WARNING The value passed to setPublicPath() should *usually* start with "/" or be a full URL (http://...). If you're not sure, then you should probably change your public path and make this message disappear.
• The manifest.json file refers to paths that start with /, therefore the browser just gets 404 for everything.
• Removing the leading / manually makes JS and CSS load again, but everything (and I mean everything rendered by EasyAdminBundle) is RTL, and the CodeEditor field doesn't accept input, and I'm also missing fonts

[javiereguiluz]

Regarding the asset building, you are not doing anything wrong ... but because of how we need to define assets in this project, you need to run another command after running yarn build. See

EasyAdminBundle/Makefile

Lines 28 to 30 in 3b7e8c4

	build-assets: ## Rebuild assets after changes in JS or SCSS
	yarn encore production
	php ./src/Resources/bin/fix-assets-manifest-file.php

[Uplink03]

Thanks @javiereguiluz . I didn't notice that Makefile there. It's all built now.

[javiereguiluz]

I really like this proposal. It looks really nice in the detail page. Thanks a lot @Uplink03!