Another config option on my quest to a `*_path` variant for every secret. Adds the config options `recaptcha_private_key_path` and `recaptcha_public_key_path`. Tests and docs are included. A public key is of course no secret, but it is closely related to the private key, so it’s still useful to have a `*_path` variant for it.
Configuration
This section contains information on tweaking Synapse via the various options in the configuration file. A configuration file should have been generated when you installed Synapse.