This commit removes the raw:: html directive (with the exception of an embedded animation) because:
- It is not supported by the dark theme and looks bad.
- It's a legacy directive, and we no longer need it on index pages.
Fixes https://github.com/scylladb/scylladb/issues/20881Closesscylladb/scylladb#21062
Fixes https://github.com/scylladb/scylladb/issues/13808
This commit moves cloud instance recommendations from
the Requirements page to a new dedicated page.
The content of subsections is simply copy-pasted, but
I added the introduction and metadata for better
searchability.
