Update webhook trigger documentation

[alderete]

Proposed change

• Correct explanation of data option in example curl command.
• Separate data and security details into subsections
• Expand on security details
• HTTP request type support information

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

Hopefully this is an improvement to the existing doc for existing behavior. It's also intended to make it easier to add or change details for future webhook improvements. (There are a couple open PRs for feature improvements, but those are not coupled to these changes.)

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.
• The documentation follows the Home Assistant documentation standards.

[homeassistant]

Hi @alderete,

It seems you haven't yet signed a CLA. Please do so here.

Once you do that we will be able to review and accept this pull request.

Thanks!

[frenck]

Thanks, @alderete 👍