VSCode extension doesn't work for all Essence keywords

[N-J-Martin]

The Essence VSCode extension, where you should be able to hover over Essence keywords with your mouse, and the bits page for that keyword , or a link to create the bits page should appear. However, this doesn't work for all keywords. And doesn't appear to be entirely based on the lexemes.

[ozgurakgun]

Thanks! Ref #630 for an initial discussion on this.