Add section about customizing mail (#7419)

See https://github.com/go-gitea/gitea/issues/6037
4 years ago · a0820e09fb
--- a/docs/content/doc/advanced/customizing-gitea.en-us.md
+++ b/docs/content/doc/advanced/customizing-gitea.en-us.md
@ -98,6 +98,20 @@ Apart from `extra_links.tmpl` and `extra_tabs.tmpl`, there are other useful temp
 - `body_outer_post.tmpl`, before the bottom `<footer>` element.
 - `footer.tmpl`, right before the end of the `<body>` tag, a good place for additional Javascript.

 ## Customizing Gitea mails

 The `custom/templates/mail` folder allows changing the body of every mail of Gitea.
 Templates to override can be found in the
 [`templates/mail`](https://github.com/go-gitea/gitea/tree/master/templates/mail)
 directory of Gitea source.
 Override by making a copy of the file under `custom/templates/mail` using a
 full path structure matching source.

 Any statement contained inside `{{` and `}}` are Gitea's template
 syntax and shouldn't be touched without fully understanding these components.



 ## Adding Analytics to Gitea

 Google Analytics, Matomo (previously Piwik), and other analytics services can be added to Gitea. To add the tracking code, refer to the `Other additions to the page` section of this document, and add the JavaScript to the `custom/templates/custom/header.tmpl` file.