[FR]: Change URL of all feeds in a feed category in one action

[RetroAbstract]

Brief description of the feature request

This feature would allow the user to modify the URL of all feeds within a feed category in one action. This would be useful for users who have lots of feeds from one instance of a privacy oriented frontend.

Invidious for example, if I would like to change all the feeds I have in an "Invidious" feed category from one instance to another, I could: Right click the feed category title > "Edit URL of all feeds in category".

If I had 5 Invidious feeds in my "Invidious" category, the feature would allow me to do this in one action:

invidious.snopyta.org/feed/channel/example1 -> yewtu.be/feed/channel/example1 invidious.snopyta.org/feed/channel/example2 -> yewtu.be/feed/channel/example2 invidious.snopyta.org/feed/channel/example3 -> yewtu.be/feed/channel/example3 invidious.snopyta.org/feed/channel/example4 -> yewtu.be/feed/channel/example4 invidious.snopyta.org/feed/channel/example5 -> yewtu.be/feed/channel/example5