chore(docs): format `mdx` files

[sripwoud]

Fix #503

prettier doesn't not have proper support for MDX v3. So we need to use another formatter to format the mdx files used for the docs website. Docusaurus recommends remark.
So this PR sets up remark in the docs apps package and uses it to format all mdx files.

Test plan

• [ ] yarn format should be successful
• [ ] modify some mdx file: yarn format:write should reformat it correctly
• [ ] yarn workspace semaphore-docs start: should start the server without warnings or errors
• [ ] navigate to the doc pages modified by this PR: everything should be rendered correctly

[vplasencia]

Hey! Thanks for testing it. Could you try cd apps/docs and then yarn start and let me know if you can see the docs website without any issues?

[sripwoud]

Hey! Thanks for testing it. Could you try cd apps/docs and then yarn start and let me know if you can see the docs website without any issues?

Right, it indeed breaks the build. But I find a way to both format the mdx file and have a working build.

And we have another issue I captured here #756 : the ci should have detected this PR broke the build at first

[openzeppelin-code[bot]]

chore(docs): format mdx files

Generated at commit: 40f2e153807be33e57f4897235ecd1b359295a73

🚨 Report Summary

	Severity Level	Results
Contracts	Critical High Medium Low Note Total	0 0 0 4 16 20
Dependencies	Critical High Medium Low Note Total	0 0 0 0 0 0

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[sripwoud]

@vplasencia ready for review