* Add CORP headers to media repo
MSC: https://github.com/matrix-org/matrix-spec-proposals/pull/3828
* Write weird CSS rules to make added-in work inline in the CS spec
Even though our content doesn't need 2 paragraphs, it's good to have the capability to render it in the future.
* Remove test paragraph
* Refine prose
* spelling is key
* Configure syntax highlighter to use CSS classes
the inline `style` attributes cause CSP errors (and don't work). Instead, we
can use proper CSS classes.
* Configure response headers for Hugo dev server
make the dev server serve response headers which match the live site, for
better testing.
Now that we've dropped the old build pipeline (and an assets directory does not exist in the repo any longer, we can rename the hugo version of the assets (assets-hugo) created during the build tools migration back to simply assets.
David Robertson