28 saveable email templactes frontend implementation

[ethanhmaness]

Description

Email template editor is now populated with existing email templates. There is now a save button for each template which will save the contents of the email editor to the database by upserting with the current template type.

Relevant issue(s)

https://github.com/hack4impact-utk/Maintenance-Team/issues/28

To Test

Go to the page, type some stuff, press the save button, reload the page or check database and see that the stuff you wrote is now there.

Type of change

• [x] New feature (non-breaking change which adds functionality)

Checklist:

• [x] My code follows the style guidelines of this project
• [x] I have performed a self-review of my code
• [x] I have commented my code, particularly in hard-to-understand areas
• [x] I have made corresponding changes to the documentation
• [x] My changes generate no new warnings
• [x] I have added tests that prove my fix is effective or that my feature works
• [x] I have assigned reviewers to this PR