Doc/Michelson: replace types and instructions by a link

Context

Answers this part of #4077:

• delete the parts about instructions from the static reference:
  • and then, at the end, by removing all the links that were added this way and replace them with a unique one;

All supported types and instructions have been migrated to the interactive reference.

So let's remove the duplication of describing types and instructions.

Manually testing the MR

make -C docs -j

And then open docs/_build/alpha/michelson.html in a web browser.

Or open the exposed artifacts Documentation - excluding old protocols below, and navigate to docs/_build/alpha/michelson.html.

Checklist

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