feat: delete tag

[sophiazlin]

delete tag

Issue Number(s): #187

What does this PR change and why?
Adds the ability to delete tags from Add a New Standard

Checklist

• Tags on the "Add a New Standard Page" are able to be deleted.
• Small X that appears next to every tag on a hover is used to delete.
• When the X is clicked, a pop-up shows to make sure the user really wants to delete the tag.
• The tag is not deleted from any existing standard, it is just deleted from these options (if possible).

How to Test

Open Add a New Standard, hover over tag, click 'x'.

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