Time-based templates update automatically now

[amelchio]

Proposed change

Using now() will now cause a template to update automatically so we can remove all the tricks for working around it not doing that.

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: Implement time tracking in templates core#41147 Refresh now() templates on second=0 core#42225
• 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.

[bdraco]

Looks good. I didn't have anything else useful to add.

[frenck]

These sections still apply, right?

{{ range(0,100)|random }}

[amelchio]

The random does not cause automatic updates but I don't think it's worth having these sections just for that, it would cause confusion rather than clear it up IMO.

[frenck]

Honestly, I do not agree, especially since I'm not making the example above up. It was a genuine question I had from people.

I don't see how that example is any different from now(). Just because now() is handled, doesn't render these sections invalid.

[amelchio]

Okay but the text removed here never did much to address random. I added a new subsection about this question in #15394.