99 tidy up git learning resources page

[Lsnaathorst1]

Overview of changes

Adding the link to DevOps guidance right at the top of the page in a call-out box. Suggested tidying up the page a little by adding an extra header and moving the email links from the top section to be with the SDT email address below.

Why are these changes being made?

So users can navigate the page a little easier and know what to find in each section, plus make it much easier for users to find the DevOps guidance

Detailed description of changes

Added the DevOps link in a callout at the top of the page. This was originally done for us by an external user as per this PR:
#102. We were unable to approve this as it was forked.

I have then also attempted to tidy up the page a little by adding an extra heading and moving the email address support to be together. I have then removed the bullets from the SDT email and added to the paragraph as they don't format nicely with the other emails there (looks odd that only that one has bullets and is hard to make it clear they are only applying to the SDT email)

Issue ticket number/s and link

#99

Checklist before requesting a review

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