Anova sous vide documenation

[Lash-L]

EDIT: Sorry to anyone I requested a review from, I accidentally had my code based off of current instead of next, I had fixed it locally but I didn't push. I resolved it now, but sorry for any notifications. Not sure how to remove the reviewers.

Proposed change

Adds documenation for new Anova Sous Vide Integration

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 Anova integration core#86254
• Link to parent pull request in the Brands repository: added branding for anova brands#4050
• This PR fixes or closes issue: fixes #

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.