Added community-driven approach

Added explanations about community as suggested in GH comments

Author: cyrusmsk

book/dlang.org.ddoc

@@ -266,7 +266,7 @@ $(SUBMENU_MANUAL
     $(SUBMENU_LINK $(ROOT_DIR)orgs-using-d.html, Orgs using D)
     $(SUBMENU_LINK https://twitter.com/search?q=%23dlang, Twitter)
     $(SUBMENU_LINK $(ROOT_DIR)calendar.html, Calendar)
-    $(SUBMENU_LINK https://discord.gg/bMZk9Q4, Discord)
+    $(SUBMENU_LINK https://discord.gg/bMZk9Q4, Discord (community-run))
     $(SUBMENU_LINK_DIVIDER https://forum.dlang.org, Forums)
     $(SUBMENU_LINK irc://irc.libera.chat/d, IRC)
     $(SUBMENU_LINK https://wiki.dlang.org, Wiki)

dlang.org.ddoc

@@ -268,7 +268,7 @@ $(SUBMENU_MANUAL
     $(SUBMENU_LINK https://dlang.org/blog, Blog)
     $(SUBMENU_LINK $(ROOT_DIR)orgs-using-d.html, Orgs using D)
     $(SUBMENU_LINK https://twitter.com/search?q=%23dlang, Twitter)
-    $(SUBMENU_LINK https://discord.gg/bMZk9Q4, Discord)
+    $(SUBMENU_LINK https://discord.gg/bMZk9Q4, Discord (community-run))
     $(SUBMENU_LINK_DIVIDER https://forum.dlang.org, Forums)
     $(SUBMENU_LINK irc://irc.libera.chat/d, IRC)
     $(SUBMENU_LINK https://wiki.dlang.org, Wiki)