Reflect current restrictions on 64-bit Raspberry Pi images

[agners]

Proposed change

The current Raspberry Pi images (with current Home Assistant Core
releases) does work fine for GPIOs as well as various HATs. Drop the
hints about 32-bit.

The 32-bit variant also boots fine with the 8GB variant now. However,
using the 64-bit variant is still recommended since the OS level support
does not need not that well tested features such as LPAE etc.

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:
• Link to parent pull request in the Brands repository:
• This PR fixes or closes issue:

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.