feat: sticky feedback component

[melissag-ensemble]

Description

Make feedback component sticky by applying changes from AdobeDocs/commerce-webapi#269 to aio-theme

Related Issue

https://jira.corp.adobe.com/browse/DEVSITE-1070

Motivation and Context

• User engagement increased significantly with sticky feedback component in an experiment done by commerce team
• Devsite-team decided to make this the default design for the Feedback/MDXFilter component in the aio-theme:

How Has This Been Tested?

Screenshots (if appropriate):

Desktop:

Mobile:

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• I have signed the Adobe Open Source CLA.
• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have read the CONTRIBUTING document.
• I have added tests to cover my changes.
• All new and existing tests passed.