use borg instead attic except at the places where it was used:
- as toplevel package name, directory name, file name
- to refer to original attic
remove sphinx upload make command, will be replaced by github.io site later
remove references to binary downloads and linux packages for now
remove some software name references, fix grammar
use borgbackup rather than borg-backup (or borg) in URLs,
less name collision issues, better search results, no validity issues with "-"
Instead of giving all files a fixed block count of 1, this assigns each
deduplicated chunk to a certain file. In effect, the cumulative file
size that is shown in the mountpoint accurately reflects the amount of
actual disk space needed for the repository (barring metadata overhead).
Although the block assignment is done arbitrarily, depending on the
user's access pattern, the sizes will be consistent within the entire
mount point. This facilitates the use of tools like du and ncdu for
inspecting the actual disk usage in a repository as opposed to just
looking at the original, uncompressed, non-deduplicated file sizes.