[Serverless][8.16] Notes docs

[nastasha-solomon]

Contributes to #5441

ESS:

• Notes: New page that details how to create, view, and manage notes
• Manage detection alerts | Take actions on an alert: Added a list item for adding notes to alerts
• View detection alert details: Several changes:
  • Updates the list of actions that you can take from the right panel and refreshes multiple images
  • Created a new section for the Notes tab
• Timeline | Configure Timeline event context and display: Updates the list item about the note functionality
• Advanced setting | Specify the maximum number of notes for alerts and events: Docs the new securitySolution:maxUnassociatedNotes advanced setting

Serverless: (Same changes as detailed above)

• Notes
• Manage detection alerts | Take actions on an alert
• View detection alert details
• Timeline | Configure Timeline event context and display
• Advanced setting | Specify the maximum number of notes for alerts and events

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[PhilippeOberti]

I've only taken a look at the notes so far. It looks good, I left a few comments

[mergify]

This pull request is now in conflicts. Could you fix it @nastasha-solomon? 🙏
To fixup this pull request, you can check out it locally. See documentation: https://help.github.com/articles/checking-out-pull-requests-locally/

git fetch upstream
git checkout -b issue-5441-the-notes-expansion upstream/issue-5441-the-notes-expansion
git merge upstream/main
git push upstream issue-5441-the-notes-expansion

[PhilippeOberti]

this looks awesome, thanks for making all the changes!

There is a //Note to self text in a couple of places, I'm just highlighting it just in case