mod_http_oauth2: Create proper template for OOB code delivery This also improves security by reusing the security and cache headers, where mod_http_errors/http-message doesn't add such headers. Colors selected by taking rotating the error colors, rrggbb -> ggbbrr

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labels:
- Statistics
summary: Collect statistics on user registration
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Description
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This module measures the rate at which users register on the server (through
providers like `mod_register_ibr` or `mod_register_web`).