Update Web Content Caching section with Clear-Site-Data

[r3dg33k]

Expanded section on web content caching to include Clear-Site-Data header usage for session cleanup.

You're A Rockstar

Thank you for submitting a Pull Request (PR) to the Cheat Sheet Series.

🚩 If your PR is related to grammar/typo mistakes, please double-check the file for other mistakes in order to fix all the issues in the current cheat sheet.

Please make sure that for your contribution:

• In case of a new Cheat Sheet, you have used the Cheat Sheet template.
• All the markdown files do not raise any validation policy violation, see the policy.
• All the markdown files follow these format rules.
• All your assets are stored in the assets folder.
• All the images used are in the PNG format.
• Any references to websites have been formatted as [TEXT](URL)
• You verified/tested the effectiveness of your contribution (e.g., the defensive code proposed is really an effective remediation? Please verify it works!).
• The CI build of your PR pass, see the build status here.

If your PR is related to an issue, please finish your PR text with the following line:

This PR fixes issue #<REPLACE WITH ISSUE NUMBER>.

AI Tool Usage Disclosure (required for all PRs)

Please select one of the following options:

• [*] I have NOT used any AI tool to generate the contents of this PR.
• I have used AI tools to generate the contents of this PR. I have verified
  the contents and I affirm the results. The LLM used is [llm name and version]
  and the prompt used is [your prompt here]. [Feel free to add more details if needed]

Thank you again for your contribution 😃

[Copilot]

Pull request overview

This PR enhances the Session Management Cheat Sheet by adding guidance on using the Clear-Site-Data HTTP header for comprehensive session cleanup. The update expands the Web Content Caching section to include best practices for removing cached data when sessions end, complementing existing cache prevention measures.

Changes:

• Updated section title from "Web Content Caching" to "Web Content Caching and Clear-Site-Data"
• Added new paragraph explaining Clear-Site-Data header usage during logout/session termination
• Enhanced the existing note with additional context about Clear-Site-Data's cache clearing behavior

---

💡 Add Copilot custom instructions for smarter, more guided reviews. Learn how to get started.

[jmanico]

Good work