Move add/edit form to a modal

[SlyAceZeta]

Adding or editing a Pokémon is currently done through the last row in the table. This can get unwieldy if there's a lot of rows. This is also poor UX for editing, since editing an entry near the top of the page requires moving to the bottom of the page.

• [x] Create modular modal system (input rows with left-aligned labels, button rows... this will be important if/when making future modals)
• [x] Migrate existing form to modal system

[SlyAceZeta]

After looking into potential solutions, including a custom-coded one, I've fallen in love with jQuery Modal. I tried the test site on my phone and it works brilliantly on mobile, and it's very easy to code and style with.

Quick desktop preview below. I just need to migrate the rest of the form and update the scripts. Adding any more info per #11 is going to make this a much longer form, so that issue might get retooled into creating a tab system inside this modal, something like a Pokémon's summary screen.