Update existing example apps in other repositories

[nkshah2]

• Update the READMEs for the Angular and Vue example apps in supertokens-auth-react to use create-supertokens-app instead (Also remove the code for the example apps)
• All example apps for the recipes covered by the CLI should be removed from other repositories (supertokens-node, supertokens-python, supertokens-golang, supertokens-auth-react) and should either link to this repository or explain how to use the CLI to see the example app