Embedded map settings changes

[TaiWilkin]

Overview

Several elements of the embedded map settings page required minor updates.

• Updated the text copy to reflect the updated content in the wireframes.
• Set the individual contributor fields to be turned off by default, to reflect the actual initial state of the data (the EmbedFields aren't created until a change is made on the settings page).
• When a user with an embed_level of null (ie no embedded map access) attempts to access the settings page, shows a message stating that they aren't authorized to access the page and should reach out to OAR staff for access.

Connects #1351

Demo

Unauthorized:

Authorized:

Notes

Text copy

Testing Instructions

• Run ./scripts/server and login with a user with a null embed_level.
• Navigate to settings.
  • On the embed tab, you should see the message from the text copy.
• Change the user permissions to the highest embed level and refresh the settings.
  • You should see the usual page.
  • The text should be updated.
  • The contributor fields should not be selected by default.
• Select the contributor fields.
  • The fields should be selectable and maintain their selection on refresh as before.

Checklist

• fixup! commits have been squashed
• CI passes after rebase
• CHANGELOG.md updated with summary of features or fixes, following Keep a Changelog guidelines

[caseycesari]

Couple of typos, but otherwise good to go.

[caseycesari]

Typo: or -> of.

[caseycesari]

Typo: Once you have activated -> Once you have activated it

[TaiWilkin]

Thanks for reviewing!