[docs] Migrate Experience_API_(xAPI)

[sarjona]

Migrates https://docs.moodle.org/dev/Experience_API_(xAPI)

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[github-actions]

⚡️ Lighthouse report for the deploy preview of this PR

URL	Performance	Accessibility	Best Practices	SEO	PWA	Report
/	🟠 64	🟠 87	🟢 100	🟢 90	🟢 100	Report
/docs/apis/commonfiles	🔴 48	🟠 85	🟢 100	🟢 100	🟢 100	Report
/general/development/gettingstarted	🟠 55	🟠 87	🟢 100	🟢 90	🟢 100	Report
/general/releases	🔴 49	🟠 87	🟢 100	🟢 100	🟢 100	Report

[paulholden]

First time I actually read what the x in xAPI actually stood for

There's a few grammatical errors that would be worth addressing here I think, thanks Sara!

[sarjona]

Hi @paulholden!
Thanks a lot for reviewing this patch and raising all these points. I've addressed them so, hopefully, it should be now ready to land :-)

[paulholden]

Super!