feat: textarea that supports syntax-highlighted code

[fkakatie]

this could be extracted for use beyond just admin-edit, but a small test case

Test URLs:

• Before: https://main--helix-labs-website--adobe.aem.page/tools/admin-edit/index.html
• After: https://syntax-highlight--helix-labs-website--adobe.aem.page/tools/admin-edit/index.html

[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

* [c0b846b](https://github.com/adobe/helix-labs-website/commit/c0b846b12fe126b85e77e1900579e198b98882b6) :white_check_mark: (latest) * [a2d97b3](https://github.com/adobe/helix-labs-website/commit/a2d97b36f6d68327e70b35c2f7ae61ec0358b5d8) :white_check_mark: * [0d83c67](https://github.com/adobe/helix-labs-website/commit/0d83c673e487c2f72be203ed8c8d96a1517728b2) :white_check_mark: * [445ed6a](https://github.com/adobe/helix-labs-website/commit/445ed6a883935eead26131fb56e22599dabcbe83) :white_check_mark: * [db03f5a](https://github.com/adobe/helix-labs-website/commit/db03f5ace433459a2c7e0db5c572445cf1e2de42) :white_check_mark: * [39c40bc](https://github.com/adobe/helix-labs-website/commit/39c40bc70a6610eb80cf674386a74f74147f7cf4) :white_check_mark: * [7969f86](https://github.com/adobe/helix-labs-website/commit/7969f865e72c1766bbd1aebe2fa68ac72275b492) :white_check_mark: * [6733536](https://github.com/adobe/helix-labs-website/commit/673353611d3ee342a1e5f1ce16deed018d8d44a8) :white_check_mark:

[aem-code-sync[bot]]

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:desktop_computer:	/tools/admin-edit/index.html