docs: Add top navigation tabs

* Add top tabs: Basic setup, Containers, Developers
  * these were chosen in order to be in a sensible alphabetical order
  * files moved to corresponding folders and links updated
* Add redirect from old file locations
* "Basic setup" has a lot of items. Update related pages organized
  into the "Updates" subtopic, to make it a bit more clear.

Author: ukkopahis

docs/Accessing-your-Device-from-the-internet.md renamed to docs/Basic_setup/Accessing-your-Device-from-the-internet.md

@@ -152,7 +152,7 @@ $ cat /dev/null >~/Logs/duck.log
 
 ### WireGuard
 
-WireGuard is supplied as part of IOTstack. See [WireGuard documentation](Containers/WireGuard.md).
+WireGuard is supplied as part of IOTstack. See [WireGuard documentation](../Containers/WireGuard.md).
 
 ### PiVPN
 

docs/Backup-and-Restore.md renamed to docs/Basic_setup/Backup-and-Restore.md

@@ -125,7 +125,7 @@ services:
     environment:
 ```
 
-This will remove the default environment variables set in the template, and tell docker-compose to use the variables specified in your file. It is not mandatory that the *.env file be placed in the service's service directory, but is strongly suggested. Keep in mind the [PostBuild Script](PostBuild-Script.md) functionality to automatically copy your *.env files into their directories on successful build if you need to.
+This will remove the default environment variables set in the template, and tell docker-compose to use the variables specified in your file. It is not mandatory that the *.env file be placed in the service's service directory, but is strongly suggested. Keep in mind the [PostBuild Script](../Developers/PostBuild-Script.md) functionality to automatically copy your *.env files into their directories on successful build if you need to.
 
 ### Adding custom services
 

docs/Custom.md renamed to docs/Basic_setup/Custom.md

@@ -1,4 +1,4 @@
-# Build Stack Default Passwords for Services
+# Default Passwords and ports
 
 Here you can find a list of the default configurations for IOTstack for quick referece.