add rest_api.md and git_webhook.md help documents

docs/help/git_webhooks.md

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+## Configure git webhooks
+
+First, follow instructions at [/docs/rest_api.md](/docs/rest_api.md)
+
+### Generate API key
+> /msg &lt;bot> apikey <comment> /api/github /api/gitea`
+e.g.
+> /msg &lt;bot> apikey github-jesopo /api/github /api/gitea`
+
+### Enable hook in-channel
+
+#### For single repository
+> !webhook add <organisation>/<repository>
+
+#### For whole organisation
+> !webhook add <organisation>
+
+### Format webhook URL
+
+GitHub: `https://example.com:5000/api/github?key=<apikey>`
+Gitea: `https://example.com:5000/api/gitea?key=<apikey>`

docs/help/rest_api.md

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+## Configure REST API
+
+### Enable REST API
+* `/msg <bot> config bot rest-api on`
+* `/msg <bot> reloadmodule rest_api`
+
+### Configure HTTPd
+#### Nginx
+* Copy example config file from [docs/rest_api/nginx](docs/rest_api/nginx) to `/etc/nginx/sites-enabled`
+* Edit `server-name`, `ssl_certificate` and `ssl_certificate_key`
+* `service nginx restart`