glossary: create stand-alone page

[jorgeorpinel]

It would be nice to have a Glossary menu item on the nav bar (or/and linked from tooltips) that opens a page where all these terms are listed (with <a name='the-term'> anchors. Extra steps:

• This is mainly to link from glossary descriptions (because we can't have tooltips inside tooltips)
  Note: currently bold words in tooltip texts mark other glossary entries;
• and to read the full list in case anyone is curious.

Extracted from #518 (comment)

• Check whether guide: new DVC Concepts section #550 is still necessary

[jorgeorpinel]

At this point I think we're definitely merging this idea and the basic concepts so lets close this in favor of #550?

[shcheklein]

Agreed!