Add info text on Migration Step for better UX

[daniel0ar]

Clear and concise description of the problem

The Migrate from OPML section on welcome doesn't have info on what an OPML file is or it's unclear if this is where a setup migration should happend (migrating setup from another RSS platform).

Suggested solution

Add a small paragraph tag instead of the text "OPML File" that is currently displayed above the file input: "If you have used RSS before, you can export your data config to an OMPL file and import it here", as seen in the following image:

I can send a PR with this 👍🏽

Alternative

No response

Additional context

No response

Validations

• Check that there isn't already an issue that request the same feature to avoid creating a duplicate.

[linear]

FOL-867 Add info text on Migration Step for better UX

[Innei]

@hyoban What do you think?

[hyoban]

It would be nice to add a description, pr welcome