feat(rum-explorer): add the ability to show a help link for each facet

[aem-code-sync[bot]]

Hello, I'm the AEM Code Sync Bot and I will run some actions to deploy your branch and validate page speed. In case there are problems, just click a checkbox below to rerun the respective action.

• [ ] Re-run PSI checks
• [ ] Re-sync branch

Commits

* [deda642](https://github.com/adobe/helix-website/commit/deda6424302aa7139aced6ce565fd8dd63500c94) :white_check_mark: (latest) * [db2eb46](https://github.com/adobe/helix-website/commit/db2eb46cef894d98b3e00c34be4835e502d380a8) :white_check_mark: