Add guidance for managing team permissions in EES

[cjrace]

Overview of changes

Add guidance for managing team permissions and update the screenshot for creating an amendment of a release.

Why are these changes being made?

Have had to explain both of these to a couple of analysts recently and when going to link to the right parts of the guidance for future reference I noticed it either didn't exist or was out of date.

Detailed description of changes

1. Add guidance for publication owners on managing team permissions
2. Update guidance for creating release amendments
3. Update admin dashboard screenshot (also used in the #admin-dashboard section on the page)

Issue ticket number/s and link

No related issues.

Checklist before requesting a review

• [x] I have checked the contributing guidelines
• [x] I have checked for and linked any relevant issues that this may resolve
• [x] I have checked that these changes build locally
• [x] I understand that if merged into main, these changes will be publicly available

[cjrace]

Add guidance on publication owners managing permissions to analysts guide (and update amendment screenshots)

[cjrace]

@jen-machin when I opened R Studio it opened on another part of the page in the 'Content' heading that I decided to quickly update as well, that's worth a quick review alongside the response to the PR comments