Convert Nextcloud integration to use Brand media

[meichthys]

Proposed change

Removes the explicit reference to logo in favor of using the images in the Brand repository.

Type of change

• Spelling, grammar or other readability improvements (current branch).
• Adjusted missing or incorrect information in the current documentation (current branch).
• Added documentation for a new integration I'm adding to Home Assistant (next branch).
• I've opened up a PR to add logo's and icons in Brands repository.
• Added documentation for a new feature I'm adding to Home Assistant (next branch).
• Removed stale or deprecated documentation.

Additional information

• Link to parent pull request in the codebase: Add Nextcloud Integration core#30871
• Link to parent pull request in the Brands repository: Add nextcloud icons & logos brands#836
• This PR fixes or closes issue: N/A

Checklist

• This PR uses the correct branch, based on one of the following:
  • I made a change to the existing documentation and used the current branch.
  • I made a change that is related to an upcoming version of Home Assistant and used the next branch.
• The documentation follows the Home Assistant documentation standards.

[frenck]

There are unrelated commits in this PR. Could you please clean that up? Thanks 👍

[meichthys]

@frenck I'm not sure what happened here. Those other commits are old commits that i thought were already merged in #11780
I'm not sure how to clean this up :/

[frenck]

@meichthys The problem is you didn't create a new branch or your fork. You should create a new branch each time you start working on something new.

[meichthys]

Ok, Thanks for tolerating us noobs :)
Should i close this pull request and submit a new one on a new branch?

[frenck]

That is probably the fastest thing to do :)