Add docs for new integration PVPC hourly pricing

[azogue]

Proposed change

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).
• 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 pvpc electricity prices integration core#32092
• 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.

[frenck]

Thanks for the PR @azogue!

Reviewed it and left some comments/suggestions. Could you please take a look? Thanks! 👍

[azogue]

Reviewed it and left some comments/suggestions. Could you please take a look? Thanks! 👍

Hi @frenck, thanks for reviewing it :)

I was AFK for some days, I'll do it over this week

[frenck]

✅ Approved. Can be merged as soon as the parent PR gets merged.
⚠️ The ha_release might need an update before merging this one in.

[azogue]

Can be merged as soon as the parent PR gets merged.

For the parent PR I'm also doing some changes on the used endpoint for the pricing API (moving from xml file to JSON, as I'm experiencing better availability for that one),

so it may take a bit

[frenck]

That is OK, it will wait in the "awaits-parent" lane until the parent is ready.