Add clarity to CLI prompt for where repository is hosted

[spencercorwin]

Users, including myself, have put the wrong link in answer to "Where is the repository hosted?". This is a simple fix that should make it clearer what to input.

What: Changes prompts in the CLI to be more specific when asking for where the repository is hosted.

Why: This is necessary because users (including myself) have become confused on what to put for this. For example, I put "www.github.com/username/repository" for my use of all-contributors-cli, when it should only be the default "www.github.com".

How: Changes prompt to be more directional.

Checklist:

• Documentation N/A
• Tests N/A
• Ready to be merged
• Added myself to contributors table N/A

[codecov-io]

Codecov Report

Merging #103 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #103   +/-   ##
=======================================
  Coverage   57.83%   57.83%           
=======================================
  Files          19       19           
  Lines         434      434           
  Branches       73       73           
=======================================
  Hits          251      251           
  Misses        152      152           
  Partials       31       31

Impacted Files	Coverage Δ
src/init/prompt.js	0% <ø> (ø)	⬆️

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[kentcdodds]

Cool, thanks!