Update template #28, #33, #34

[m-mohr]

Updated the template repository:

1. Updated dependencies
2. Updated examples to STAC 1.1.0
3. Default version is 0.1.0 instead of 1.0.0
4. Added bands as a field scope Extensions should indicate if they are usable in Bands #34
5. Added link and asset templates as options
6. Don't error when we use GitHub note/warning/... blocks
7. Extensive update of the default schema:
   1. Simplifications for the schema where possible and some more comments (we got more functionality with the same schema length)
   2. Add default schemas for bands, catalogs, summaries, links, asset templates and link templates,
   3. Try to enable some basic validation of summaries
   4. Don't check anymore whether any field of the extension exists in the document. This has proven to not work reliably and makes the schema more complex than it needs to be without providing much benefit.
   5. No template for "required fields" as most extensions don't require fields in specific places anyway and it makes the schema more complex than needed. Individual requirements can still be added by users if strictly needed.

[emmanuelmathot]

Wow. that was needed! Thanks for that!

[gadomski]

Worth adding dependabot to keep the Github Actions and Node dependency versions up-to-date?

[m-mohr]

Not sure, then I'd get like 50+ PR notifications for the extensions I maintain whenever a dependency update comes in. As we only use the dependencies for "development", I'd say we may better update manually on demand.