Remove gogit and major refactoring (#2)

* Fix typo in readme

* Reimplement all git methods without go-git

* Rename repo pkg to git, add gitconfig methods

* Improve tests for configuration reading

* Rename package file to io and move RepoFinder there

* Refactor printers

- Remove smart printer
- Decouple printers from git repos with interfaces
- Update printer functions
- Remove unnecessary flags
- Add better remote URL detection

* Update readme and go.mod

* Add author to git commit in tests

Otherwise tests will fail in CI.

* Install git before running tests and don't use cgo

* Add better error message, revert installing git

* Ensure commit message is in quotes

* Set up git config before running tests

.github/workflows/build.yml

@@ -14,5 +14,7 @@ jobs:
         uses: actions/setup-go@v2
         with:
           go-version: 1.14
+      - name: Set up Git
+        run: git config --global user.email "grdl@example.com" && git config --global user.name "grdl"
       - name: Run go test
-        run: go test ./... -v
+        run: CGO_ENABLED=0 GOOS=linux go test ./... -v