Update .gitignore to ignore specific files rather than everything not manually added

.gitignore

@@ -1 +1,4 @@
-*
+mutn
+mutn.exe
+libmuttonserver
+libmuttonserver.exe

commit.sh

@@ -1,6 +1,4 @@
 #!/bin/sh
-gofmt -l -w -s ./src/cli/*.go
+gofmt -l -w -s ./src/cli/*.go ./src/backend/*.go ./mutn.go ./libmuttonserver.go
-gofmt -l -w -s ./src/backend/*.go
+git commit -am "$1"
-git add -f completions docs src wiki .gitignore commit.sh go.mod go.sum LICENSE mutn.go libmuttonserver.go README.md
-git commit -m "$1"
 git push