MDL-81015: Remove info docs for async

[safatshahin]

Please note, that this PR is added as a part of MDL-81015.
Please refer to the tracker before merging this.

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[github-actions]

⚡️ Lighthouse report for the deploy preview of this PR

URL	Performance	Accessibility	Best Practices	SEO	PWA	Report
/	🔴 26	🟢 95	🟢 100	🟢 90	🟢 100	Report
/docs/5.0/apis/commonfiles	🔴 29	🟢 93	🟢 100	🟢 100	🟢 100	Report
/general/development/gettingstarted	🟠 50	🟢 95	🟢 100	🟢 90	🟢 100	Report
/general/releases	🔴 49	🟢 95	🟢 100	🟢 100	🟢 100	Report

[junpataleta]

Looks good! I took the liberty of resolving the conflicts and pushing to Safat's branch.