Fix issue #13: Ability to delete a term from reading screen

[dgc08]

Added delete term button in term form, visible in both /read and /term/edit:
Button in /read reloads the page
Button in /term/edit redirects to /term/index

Removed old delete button in /term/edit

Check if you're fine with the layout, I've placed the button below the "save" button, in the next table row.
This is the first JS code I have ever written lol, but it works.

[jzohrab]

Works great, thanks! I've not used fetch that way -- I'd have used an ajax post -- but this way works fine. I did change the layout to put the delete on the same row, I think that's fine as a first pass:

Rerunning the tests locally, they failed in GitHub. The ci tests are sometimes flaky, need to fix. I'll merge locally when all is good. Thanks again!

[jzohrab]

Ah, changing the delete back to a POST though, it's really a POST action, which might change the "fetch" back to an ajax post. All good.