This commit adds the ability to further suppress output for accounts
with no deleted toots using the `-qq` flag. It alsoadds the option
to completely suppress logging (excluding exceptions) by using the
`-qqq` flag
This commit adds a --retry-mins option to enable users to choose how many minutes pass
between attempts to retry a toot deletion when there is an error.
Also re-organises documentation and bumps version to 2.6.