[Feature request] Invidious companion: quality of life improvements

[unixfox]

A list of improvements for user experience:

• proxy the requests from invidious to companion if public_url is not configured. In order to avoid having to touch the reverse proxy.
• check if companion public_url accessible from invidious.

[crazycrystals]

companion docs dont seem to mention that IV companion has bad memleaks and needs to be restarted hourly just like invidious

[unixfox]

companion docs dont seem to mention that IV companion has bad memleaks and needs to be restarted hourly just like invidious

Because it's an active bug that is going to be fixed 😁: iv-org/invidious-companion#21