Redefine the filter bar and unify template.json across both galleries

[hemarina]

The filter-by bar needs to be redesigned, and the template.json schema should be kept consistent across both the awesome-azd gallery and ai gallery. Need further discussion with @haileyhuber8.

[haileyhuber8]

We need to figure out how to align these together. End state should be awesome-azd as the superset with ai-app-gallery as a curated set of templates from here and the mismatched json schema and lack of formal process for adding templates means people who add to the ai gallery dont add their templates to awesome-azd and we see the gap. We want to re-examine the filter by bar to make sure we are hitting the most important areas and it works better - an issue I see now is I can't independently scroll through the filters bar and the gallery. The filter bar is very long especially if I've opened the drop down, so if I've opened a few of the drop downs and it goes below the fold, I have to scroll to the bottom of the templates before the filter bar will scroll.