docs: update docs to explain about the new option debug

docs/configuration.md

@@ -21,6 +21,7 @@ Some of the configuration options provided in the file are stated below. These a
 # General
 
 - **logging:** An option to enable or disable logs.
+- **debug:** An option to enable or disable debug mode.
 
 ## Server
 

docs/installation.md

@@ -78,6 +78,7 @@ After that edit the config.lua file located under `websurfx` directory. In the c
 ```lua
 -- ### General ###
 logging = true -- an option to enable or disable logs.
+debug = false -- an option to enable or disable debug mode.
 
 -- ### Server ###
 port = "8080" -- port on which server should be launched