Fix minor comments from Carpentries Lab review

[svenvanderburg]

Look at https://github.com/carpentries-lab/reviews/issues/25, see if there are any minor comments that we missed and can still improve.

### Tasks
- [x] listed browser support is not matched to jupyter browser support notably, Windows' current default browser is a chromium browser and therefore supported (and on general web compatibility, better than safari by a nontrivial margin) this should be updated to include more windows users without having to install
- [x] a glossary of key terms or links out to definitions in an external glossary e.g. Glosario.

[carschno]

Extracting the specific items from https://github.com/carpentries-lab/reviews/issues/25#issuecomment-1787189928 that are still open:

• listed browser support is not matched to jupyter browser support notably, Windows' current default browser is a chromium browser and therefore supported (and on general web compatibility, better than safari by a nontrivial margin) this should be updated to include more windows users without having to install
• all episodes are 55min + episode 3 is over 3 hours long? Addressed in https://github.com/carpentries-incubator/deep-learning-intro/pull/455
• a glossary of key terms or links out to definitions in an external glossary e.g. Glosario.
• Setup: it says "open a terminal" but that is insufficient information for a Windows user (they have multiple terminals and to launch jupyter only the "anaconda prompt" by default will work; CMD or powershell typically will not) (already resolved)