Revert domain fronting fix

* revert domain fronting changes

* reintroduce HostHeader rule

* add doc for removals

docs/content/reference/static-configuration/cli-ref.md

@@ -162,9 +162,6 @@ WriteTimeout is the maximum duration before timing out writes of the response. I
 `--global.checknewversion`:  
 Periodically check if a new version has been released. (Default: ```false```)
 
-`--global.insecuresni`:  
-Allow domain fronting. If the option is not specified, it will be enabled by default. (Default: ```true```)
-
 `--global.sendanonymoususage`:  
 Periodically send anonymous usage statistics. If the option is not specified, it will be enabled by default. (Default: ```false```)
 

docs/content/reference/static-configuration/env-ref.md

@@ -162,9 +162,6 @@ WriteTimeout is the maximum duration before timing out writes of the response. I
 `TRAEFIK_GLOBAL_CHECKNEWVERSION`:  
 Periodically check if a new version has been released. (Default: ```false```)
 
-`TRAEFIK_GLOBAL_INSECURESNI`:  
-Allow domain fronting. If the option is not specified, it will be enabled by default. (Default: ```true```)
-
 `TRAEFIK_GLOBAL_SENDANONYMOUSUSAGE`:  
 Periodically send anonymous usage statistics. If the option is not specified, it will be enabled by default. (Default: ```false```)
 

docs/content/reference/static-configuration/file.toml

@@ -1,7 +1,6 @@
 [global]
   checkNewVersion = true
   sendAnonymousUsage = true
-  insecureSNI = false
 
 [serversTransport]
   insecureSkipVerify = true

docs/content/reference/static-configuration/file.yaml

@@ -1,8 +1,6 @@
 global:
   checkNewVersion: true
   sendAnonymousUsage: true
-  insecureSNI: false
-
 serversTransport:
   insecureSkipVerify: true
   rootCAs: