docs(comments): add some comments

* ci(checks): add pull request workflow and golangci-lint config

* refactor(lint): resolve golangci-lint findings

* style(tui): drop traling blank line for gofmt

* fix(cards): handle crypto/rand.Read error in storeRedirect

pkg/notify/slack.go

@@ -16,6 +16,7 @@ import (
 
 var slackClient = &http.Client{Timeout: 5 * time.Second}
 
+// dollars converts cents to dollars
 func dollars(cents int) string {
 	return fmt.Sprintf("$%.2f", float64(cents)/100)
 }