UX messages

[rimutaka]

A catch-all issue for all sorts of poor and unhelpful help messages.

• [x] multirepo setups have .git files in sub-repos, not .git folders, inform the user about such
• [ ] running stm for the first time from a folder that doesn't have .git prints an error message and not a welcome message
• [ ] printing a welcome message together with an error message looks unwelcoming
• [x] remove all remaining references to stackmuncher/stm, replace with /stm_appstackmuncher
• [x] drop all .exe - it works fine without it
• [x] add a summary of the project in the CLI output, more so on the first run
• [ ] Reformat msg about what emails are used for commits (https://github.com/stackmuncher/stm_app/issues/30#issuecomment-907697259)

[rimutaka]

max@onebro.me is your default Git commit email and will be used for notifications about your Directory Profile views and employer interest. Run stackmuncher.exe --primary_email me@example.com to set your preferred contact email. It will not be published or shared with anyone.

it should be more like:

Commit emails: max@onebro.me, xyz@example.com Add more: ... Find more: ... git shortlog ...