temporarily download from an instance provided by a url parameter

[KwiatekMiki]

describe the feature you'd like to see

for example, when you would go to https://cobalt.tools?i=https://api.instance.example, it would download from api.instance.example.

this would be useful since hosting your frontend is not needed anymore and it's harder than just copying the example docker-compose file and now i only see 6 people (only counting safe instances from hyper's instance list) hosting it for the new cobalt.

thanks to that, let's say youtube downloading isn't working on the main instance but it works on an instance you found on an instance list, for example api.instance.example, and you just want to download from it once.

before, (most of the times) you clicked the frontend link, https://instance.example, and pasted the link.

now, you need to open the normal cobalt, open settings, instances, enable "use a custom processing server", paste the link, wait 15 seconds to be able to continue, click "save", paste the link, go back into settings and disable "use a custom processing server".

additional context

if you try to set an instance in the settings for the first time, you get this message:

i feel like it should also show that message but only once until you clear your cookies (like in the settings) or once per instance

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i hope you understand what i'm trying to say

tl;dr: https://cobalt.tools?i=https://api.instance.example would be faster than going into settings to set the instance and later disable it, and i think it should show the important safety notice once ever/once per instance