* fix: Issuer of OTP URI should be URI-encoded.

follow this link https://github.com/google/google-authenticator/wiki/Key-Uri-Format .

* filter unsafe character ':' in issuer

* Use Replace rather than ReplaceAll

* refactor setting router code

splitted up one huge router settings file into the smaller files
representing the actual page structure

* move code to subfolder

* rename functions

* renamed files

* add copyright information