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:
- Stage-Alpha
summary: "XEP-0397: Instant Stream Resumption"
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Experimental and incomplete implementation of [XEP-0397: Instant Stream Resumption].