Split RUM Explorer into Stable (`rum`) and Playground (`oversight`)

[trieloff]

Let's hope the git magic trick worked as intended

• chore(rum-explorer): move to oversight folder
• chore(rum-explorer): keep rum-explorer backup
• chore(rum): like the move never happened

[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

* [e743f3f](https://github.com/adobe/helix-website/commit/e743f3fcf931f26a6fd4dbbd7b491c646f3e7ec6) :white_check_mark: (latest) * [d9e233d](https://github.com/adobe/helix-website/commit/d9e233db2d65f1f716678a7cb2a2b7d02943f92b) :white_check_mark: * [ac8fc4a](https://github.com/adobe/helix-website/commit/ac8fc4ac775ecbbb2130966f874a7f2c3b496196) :white_check_mark: * [13795e5](https://github.com/adobe/helix-website/commit/13795e50a729f64efb8d7ea58222f6127e2b8669) :white_check_mark: