docs: set unsafe HTML parsing to false and fix raw HTML insertion

This means that markdown files can't contain <thing> any more.

docs/content/swift.md

@@ -4,7 +4,7 @@ description: "Swift"
 date: "2014-04-26"
 ---
 
-<i class="fa fa-space-shuttle"></i>Swift
+{{< icon "fa fa-space-shuttle" >}}Swift
 ----------------------------------------
 
 Swift refers to [OpenStack Object Storage](https://docs.openstack.org/swift/latest/).
@@ -223,7 +223,7 @@ sufficient to determine if it is "dirty". By using `--update` along with
 `--use-server-modtime`, you can avoid the extra API call and simply upload
 files whose local modtime is newer than the time it was last uploaded.
 
-<!--- autogenerated options start - DO NOT EDIT, instead edit fs.RegInfo in backend/swift/swift.go then run make backenddocs -->
+{{< rem autogenerated options start" - DO NOT EDIT - instead edit fs.RegInfo in backend/swift/swift.go then run make backenddocs" >}}
 ### Standard Options
 
 Here are the standard options specific to swift (Openstack Swift (Rackspace Cloud Files, Memset Memstore, OVH)).
@@ -472,7 +472,7 @@ See: the [encoding section in the overview](/overview/#encoding) for more info.
 - Type:        MultiEncoder
 - Default:     Slash,InvalidUtf8
 
-<!--- autogenerated options stop -->
+{{< rem autogenerated options stop >}}
 
 ### Modified time ###