Radio controls guidebook entry (#13990)

* Added radio guidebook entry with channel designators

* Radio guidebook update

* Update Resources/Server Info/Guidebook/Controls/Radio.xml

Oh yeah, I definitely can see where a change to the radio_channels.yml would cause a desync here. I will need to look into how to link the xml to Resources\Prototypes\radio_channels.yml

Co-authored-by: Kara <lunarautomaton6@gmail.com>

* Delete .gitignore

Woops, how'd that get in there?

* Revert "Delete .gitignore"

This reverts commit 54a92b65b4cbbb39e6d162ab02cbe875ca5210d5.

* Update .gitignore

* Update .gitignore

* Update Controls.xml

* Update Controls.xml

* Less hard coded hotkey information

* Cleaned up old text

* Update .gitignore

* Update Radio.xml

---------

Co-authored-by: Kara <lunarautomaton6@gmail.com>

Resources/Prototypes/Guidebook/meta.yml

@@ -1,4 +1,6 @@
-- type: guideEntry
+- type: guideEntry
   id: Controls
   name: guide-entry-controls
-  text: "/Server Info/Guidebook/Controls.xml"
+  text: "/Server Info/Guidebook/Controls/Controls.xml"
+  children:
+  - Radio  

Resources/Prototypes/Guidebook/radio.yml

@@ -0,0 +1,4 @@
+- type: guideEntry
+  id: Radio
+  name: guide-entry-radio
+  text: "/Server Info/Guidebook/Controls/Radio.xml"