chore(docs): fix link to crates.io

The extraction logic failed to extract the GitLab URI correctly
when the configured platform endpoint does not have a trailing
slash. This commit changes the logic to handle scenarios with
and without trailing slash

Fixes #4270

This reverts commit b5c9dc8e.

Instead of generating the pseudo version ourselves, replace the existing pseudo version with a digest only and let “go get” massage it into a valid pseudo version.

This reverts commit 5aa66963.

Co-authored-by: RoamingKiwi <jacob@jacobbyrne.co.nz>

Closes #4287