update(docs): drop IRC link

Author: cconard96

README.md

@@ -22,7 +22,7 @@ We maintain a detailed documentation here -> [Documentation](https://glpi-plugin
 ## Contact
 
 For notices about major changes and general discussion of treeview, subscribe to the [/r/glpi](https://www.reddit.com/r/glpi/) subreddit.
-You can also chat with us via IRC in [#glpi on freenode](http://webchat.freenode.net/?channels=glpi) or [@glpi on Telegram](https://t.me/glpien).
+You can also chat with us via [@glpi on Telegram](https://t.me/glpien).
 
 ## Professional Services
 
@@ -42,4 +42,4 @@ Obtain a personalized service experience, associated with benefits and opportuni
 
 ## Copying
 
-* **Code**: you can redistribute it and/or modify
+* **Code**: you can redistribute it and/or modify