Test forking of HTTPS origin

[FabijanC]

Usage related changes

• Closes #424
  • Actually made closeable by #469

Development related changes

• Remove unused dependency: tower
• Improve testing: add case for #424
• Reduced line count in docs (without sacrificing legibility IMO)

Checklist:

• [x] Checked out the contribution guidelines
• [x] Applied formatting - ./scripts/format.sh
• [x] No linter errors - ./scripts/clippy_check.sh
• [x] No unused dependencies - ./scripts/check_unused_deps.sh
• [x] No spelling errors - ./scripts/check_spelling.sh
• [x] Performed code self-review
• [x] Rebased to the latest commit of the target branch (or merged it into my branch)
• [x] Updated the docs if needed, including the TODO section
• [x] Linked the issues resolvable by this PR - linking info
• [x] Updated the tests if needed; all passing - execution info