Add Case Studies section + Cemrg case study to documentation

[kallewesterling]

This PR aims to:

• Add a "Case Studies" section to the "Community of Practice" part of the documentation site for the TEA platform
• Add the Cemrg case study together with a video to this section

[coveralls]

Pull Request Test Coverage Report for Build 8988737522

Warning: This coverage report may be inaccurate.

This pull request's base commit is no longer the HEAD commit of its target branch. This means it includes changes from outside the original pull request, including, potentially, unrelated coverage changes.

• For more information on this, see Tracking coverage changes with pull request builds.
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• For a quick fix, rebase this PR at GitHub. Your next report should be accurate.

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 81.181%

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Totals
Change from base Build 8833531784:	0.0%
Covered Lines:	1251
Relevant Lines:	1541

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💛 - Coveralls