Update Sysrepo docs to 0.7.5, libyang 0.16-r1
After the recent releases that include Francis' fixes, we can move back to release versions.
The docs need to update the following:
- use libyang 0.16-r1
- use Sysrepo 0.7.5
To upload designs, you'll need to enable LFS and have an admin enable hashed storage. More information