Better UI to create RSS links (+ OPML export)?

### What feature is it?

First, this is a great project! Thank you for all the work that was put in already.

I wonder if there already exists another project with a better UI that would make it easier to create RSS URLs?

For instance, instead of reading docs https://docs.rsshub.app/, I could have

- a list of available services, like the icons Twitter and Telegram etc.
- after a click an input field to enter a username
- have below automatically the RSS feed link generated

### What problem does this feature solve?

Currently, users have to create all RSS links by hand: Copy the template URLs and edit them with their data. This works, but it is not very user friendly.

Besides, I have to create, copy and import every new RSS URL separately. This can take a lot of time if I e.g. want to add a lot of RSS feeds at once.

Instead, it would be much faster to e.g.
- add a list of Twitter users or keywords I want to "follow"
- get one [OPML](https://en.wikipedia.org/wiki/OPML) file exported including all the new RSS feeds, which I can import into my feed reader in 1 click.

Does such a project already exist?