VOTE-2328: Move #main-content id to fix andi tab order

[mlloydbixal]

VOTE-2328

Insert a link to the Jira ticket (e.g VOTE-XXX).

Description

ANDI screen reader was generating an extra 'X' where the skip nav link element was to flag where it was removed from tab order. To fix, #main-content id has been to the container of the main content in each instance.

Deployment and testing

QA/Testing instructions

1. lando retune
2. Using ANDI, turn on tab order

3. Confirm skip navigation works the same as expected 4. Confirm the "X" span isn't being added under the main nav

Checklist for the Developer

• A link to the JIRA ticket has been included above.
• No merge conflicts exist with the target branch.
• Automated tests have passed on this PR.
• A reviewer has been designated.
• Deployment and testing steps have been documented above, if applicable.

Checklist for the Peer Reviewers

• The file changes are relevant to the task objective.
• Code is readable and includes appropriate commenting.
• Code standards and best practices are followed.
• QA/Test steps were successfully completed, if applicable.
• Applicable logs are free of errors.