Update reverse-proxy.mdx

[C4J3]

Fix posters not showing up when using sub-folder (at least with NPM)

Description

Fixes title card images not appearing if using subfolders.

Screenshot (if UI-related)

Before:

After:

Aditional Notes

I know this is not officially supported but I figured this was a byproduct of the recent update and it just wasn't thought about. Small change but for idiots like me it'll save 10-100~ mins of trying to troubleshoot 😅.

[C4J3]

Possibly unrelated to this. Is the subpath not meant to be maintained for actual jellyseerr subpaths? So if I have mydomain.tld/jellyseer I go to the discovery page but if I click movies I go to mydomain.tld/discover/movies. Don't remeber if I had this behaviour previously because I mostly used requestrr and didn't use external address when connecting to Jellyseerr itself.

[Fallenbagel]

Possibly unrelated to this. Is the subpath not meant to be maintained for actual jellyseerr subpaths? So if I have mydomain.tld/jellyseer I go to the discovery page but if I click movies I go to mydomain.tld/discover/movies. Don't remeber if I had this behaviour previously because I mostly used requestrr and didn't use external address when connecting to Jellyseerr itself.

Subpath is not supported officially.

[Fallenbagel]

Also the commit message has to start from docs: ..... or this won't be reflected on the docs after merge