[Feature] documentationSupportFooter

[MitchellShiell]

To Do:

• [x] Add slack link using the external-Links.js
• [x] Add functionality of the thumbs-up and thumbs-down buttons (ID for matomo)
• [x] Add the submit an issue link
• [x] Add a feature request link
• [x] Add a PR link
• [x] Update Gihub Issues templates + Contribution.md
• [x] Have feedback buttons remain highlighted on click
• [x] Adjust padding, margins and font sizing
• [x] Make a contribution link that will go to the specific page within the repo for example:

https://github.com/overture-stack/website/blob/develop/markdown/documentation/arranger/installation/authentication.md

[daniel-cy-lu]

@MitchellShiell All good now, let me know how you think of the responsive. There is no mock-up for this so I used my best judgements. One other issue is that the happy and sad faces icons don't seem to be doing anything. I see that you wrote some css. Do you want them to invert when clicked?

[daniel-cy-lu]

@samrichca Thank you Sam!