* chore(site): upgraded site to latest hugo and removed vendored files
This switches to using github.com/google/docsy as a Hugo module,
so we don't need to vendor the theme anymore or its dependencies.
* layout
* more style, edit MD support
* style
* style
* fixed linter errors
* update text
* build(ci): added rclone 1.57.0 to Docker container images
/bin/rclone is configured to use config in /app/rclone/rclone.conf
so the user can pass -v ~/.config/rclone:/app/rclone
* pr feedback
* content: fixed repo upgrade version
Previously upgrade would enable epoch manager and index v2 but would
not set the version of the format itself. Everything worked fine
but it would not protect from old kopia opening the repository.
* ci: added compatibility test that uses real 0.8 and current binaries
Instead of using hardcore Makefile scripts and external tools, created a
specialized Go tool that combines curl, sha256sum, gunzip, tar, unzip
and automatically figures out the correct URL to download based on
the current GOOS/GOARCH combination.
