Remove Sentry integration and update dependencies in go.mod and go.sum

- Removed the Sentry initialization code from main.go.
- Deleted badge.go and shopware.go handler files.
- Updated go.mod to replace `github.com/getsentry/sentry-go` with `github.com/google/go-cmp` and `golang.org/x/crypto`.
- Updated go.sum to reflect the changes in dependencies.

This cleanup improves the codebase by removing unused dependencies and handlers.

Author: shyim

go.mod

@@ -3,13 +3,10 @@ module frosh-api
 go 1.15
 
 require (
-	github.com/getsentry/sentry-go v0.29.1
-	github.com/golang/freetype v0.0.0-20170609003504-e2365dfdc4a0 // indirect
+	github.com/google/go-cmp v0.6.0 // indirect
 	github.com/google/go-github/v53 v53.2.0
 	github.com/julienschmidt/httprouter v1.3.0
-	github.com/narqo/go-badge v0.0.0-20190124110329-d9415e4e1e9f
-	github.com/rogpeppe/go-internal v1.9.0 // indirect
 	github.com/rs/cors v1.11.1
-	golang.org/x/image v0.18.0 // indirect
+	golang.org/x/crypto v0.23.0 // indirect
 	golang.org/x/oauth2 v0.24.0
 )