Dvc.org: glossary: auto link `dvc <cmd>` strings like in docs

[jorgeorpinel]

from md strings in glossary.js

For example in this tooltip, dvc run should link to the cmd ref:

[shcheklein]

Related #https://github.com/iterative/dvc.org/issues/1045 - it should go first. We don't want to bring any complicated processing to the client side.

[jorgeorpinel]

I can also use proper md links in all glossary md text and close this with that. WDYT?

[shcheklein]

don't like the idea, tbh - we'll have to support this (in case we change something). Let's wait on #1045 first.

[shcheklein]

this is fixed now!

[jorgeorpinel]

Cool, we just need to remove all the manual links now. Added to #1431