[WIP] Add documentation for permissions sidebar item

[Copilot]

Plan for Adding Permissions Documentation

• Research and understand what PRs 2055 and 2060 are about
• Create permissions documentation directory structure
• Write overview documentation for permissions
• Document permission models and RBAC concepts
• Document how to configure and manage permissions
• Create sidebar structure with "Permissions" as 1st level menu
• Move existing permission-related docs to Permissions section
• Update sidebars.js to include new Permissions category
• Test documentation locally with yarn start
• Run linters to ensure quality
• Take screenshots of the changes

Original prompt

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This section details on the original issue you should resolve

<issue_title>[docs] add docs for the PR: 2055</issue_title>
<issue_description>Improve the related docs page based on the newly merged PRs:

• fix: refactor permission checks to Setting.js the-open-agent/openagent#2055
• fix: refactor admin permission checks into util package the-open-agent/openagent#2060

You should write high-quality human-like docs for a modern OSS software. Don't write in the GPT-flavor. Don't write too long, keep it tidy docs. Don't use itemized list to describe things like "Use Cases", "Best practice" or "what it can do"
don't change yarn.lock
Don't add too long text, keep it short and to the point
Don't add the docs in a template like one section name and one text paragraph. You need to organize the content to be user-friendly and not boring for users to read

need to add "Permissions" as 1st level sidebar menu item to hold the above contents. Also other existing permision related documents should also move into "Permissions" 1st level menu item</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes [docs] add docs for the PRs: 2055, 2060 #115

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