Docs are not able to load github's markdown files

__Expected behavior:__
The documentation site should display all the documentation correctly

__Describe the bug:__
The documentation pages that depend on file URLs like https://raw.githubusercontent.com/cssinjs/jss/v10.9.2/docs/features.md are blank because the URL is no longer valid.

__Reproduction:__
visit https://cssinjs.org/features?v=v10.9.2 or any other page that depends on .md files for documentation

Open https://cssinjs.org/features?v=v10.9.2 and inspect the documentation page that depends on https://raw.githubusercontent.com/cssinjs/jss/v10.9.2/docs/features.md. Trace how the site loads that Markdown URL and verify the page renders its documentation correctly after the URL handling is addressed.

Written by the indexing model from the issue text.