Draft: Resolve "[ENG] Company Contentful Improvements"

Step 1: What is changing in this MR?

• Creating a service where a contentful page entry has to go through a dedicated function to handle each different children content types
• Within each content type mapping, I have a more specific mapping depending on the component. This is necessary as a contentful entry can map to more than one Vue component file. I a defined default type so that new entries would conform to that default and not break the page.

Production	Review app
https://about.gitlab.com/	WIP

Step 2: Ensure that your changes comply with the following, where applicable:

• I, the Assignee, have run Axe tools on any updated pages, and fixed the relevant accessibility issues.
• These changes work on both Safari, Chrome, and Firefox.
• These changes have been reviewed for Visual Quality Assurance and Functional Quality Assurance on Mobile, Desktop, and Tablet.
• These changes work with our Google Analytics and SEO tools.
• These changes have been documented as expected.

Build Variables:

• Use Contentful Preview API

Closes #3395