Add general topic tags and refine download functionality

[mciethan]

Fixes #29 by refining the download functionality Supersedes #47 with a checkbox format for general topics that treats them like filters instead of adding an additional layer of data nesting

to-do:

• [x] checkboxGroupInput user interface
• [x] get checkboxes to interact correctly with topic selection list
• [x] fix neighborhoods download bug
• [x] fix labor force years bug for neighborhoods
• [x] create a download confirmation window
• [x] confirm details with others
• [x] remove bar chart hover functionality
• [x] clean up code

[mciethan]

I forgot to merge this and then proceeded to make other edits on main which caused conflicts (oops), but all the changes in this PR are now implemented on main