docs: add architecture diagram for reverse tunnels (#41355)

## Description

This PR adds an architecture diagram for reverse tunnels and does some
minor refactors.

---

**Commit Message:** docs: add architecture diagram for reverse tunnels
**Additional Description:** Added architecture diagram for reverse
tunnels.
**Risk Level:** N/A
**Testing:** CI
**Docs Changes:** N/A
**Release Notes:** N/A

---------

Signed-off-by: Rohit Agrawal <[email protected]>

Author: agrawroh

configs/reverse_connection/initiator-envoy.yaml renamed to docs/root/_configs/reverse_connection/initiator-envoy.yaml

@@ -78,21 +78,3 @@ static_resources:
               socket_address:
                 address: downstream-service
                 port_value: 80
-
-admin:
-  access_log:
-  - name: envoy.access_loggers.file
-    typed_config:
-      "@type": type.googleapis.com/envoy.extensions.access_loggers.file.v3.FileAccessLog
-      path: "/dev/stdout"
-  address:
-    socket_address:
-      protocol: TCP
-      address: 0.0.0.0
-      port_value: 8888
-
-layered_runtime:
-  layers:
-  - name: layer
-    static_layer:
-      re2.max_program_size.error_level: 1000

configs/reverse_connection/responder-envoy.yaml renamed to docs/root/_configs/reverse_connection/responder-envoy.yaml

@@ -110,21 +110,3 @@ static_resources:
         explicit_http_config:
           # Right the moment, reverse connections are supported over HTTP/2 only.
           http2_protocol_options: {}
-
-admin:
-  access_log:
-  - name: envoy.access_loggers.file
-    typed_config:
-      "@type": type.googleapis.com/envoy.extensions.access_loggers.file.v3.FileAccessLog
-      path: "/dev/stdout"
-  address:
-    socket_address:
-      address: 0.0.0.0
-      port_value: 8888
-
-layered_runtime:
-  layers:
-  - name: layer
-    static_layer:
-      re2.max_program_size.error_level: 1000
-      envoy.reloadable_features.reverse_conn_force_local_reply: true