Update 'Get help and contribute' section across all pages

[murrlipp]

What

The 'Get help and contribute' section was updated during the updates to the button menu component. This was made as a local change and the update needs to be made to all component, pattern and page pages on the design system site.

Why

For a consistent experience between different pages.

Who needs to be involved

• Interaction Designer
• Content Designer

Tasks

• [x] Make changes to nunjucks partial
• [x] Account for instances where there are no contributors
• [x] Remove template from index pages and archived component pages
• [ ] Once button menu changes are deployed, create PR
• [ ] PR reviewed

Done

Add info about what this task looks like when it's done.

[murrlipp]

The branch for this work is here: https://github.com/ministryofjustice/moj-frontend/tree/help-and-feedback-changes

Once the button menu branch is merged to main I'll pull down, check, and create a PR.