Added variable height for Admin neighborhood completion histogram and…

[nschung28]

Resolves #3565

Made neighborhood completion histogram height variable depending on the dataset and also increased the font size of the neighborhoods on the y-axis.

Testing instructions

1. Load any city to test the histogram on the Admin page.

Things to check before submitting the PR

• [x] I've written a descriptive PR title.
• [x] I've added/updated comments for large or confusing blocks of code.
• [ ] I've included before/after screenshots above.
• [ ] I've asked for and included translations for any user facing text that was added or modified.
• [ ] I've updated any logging. Clicks, keyboard presses, and other user interactions should be logged. If you're not sure how (or if you need to update the logging), ask Mikey. Then make sure the documentation on this wiki page is up to date for the logs you added/updated.
• [ ] I've tested on mobile (only needed for validation page).

[misaugstad]

@nschung28 there should definitely be screenshots for this!