Reordered list of community resources

1. Removal of "Community":
The term "Community" was removed because it's redundant—it's already clear that this is a Discord server dedicated to the D programming language. Additionally, the server has recently become the official Discord for the D language, which further reinforces its purpose.

2. Prioritizing Discord Over Forums:
Discord is a modern, widely-used platform for community engagement. Compared to traditional forums, it offers more dynamic interaction and has become the go-to place for many programming languages and tech libraries to build and support their communities.

Given how human attention typically works—elements placed higher on a page get more visibility—positioning the Discord link above the Forum link is a simple yet effective way to boost community engagement. It reflects the current trend and gives users quicker access to the most active hub of discussion and support.

Author: cyrusmsk

book/dlang.org.ddoc

@@ -266,9 +266,9 @@ $(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_DIVIDER https://forum.dlang.org, Forums)
     $(SUBMENU_LINK irc://irc.libera.chat/d, IRC)
-    $(SUBMENU_LINK https://discord.gg/bMZk9Q4, Community Discord)
     $(SUBMENU_LINK https://wiki.dlang.org, Wiki)
     $(SUBMENU_LINK_DIVIDER $(ROOT_DIR)bugstats.html, Issues)
     $(SUBMENU_LINK $(ROOT_DIR)contributing.html, Contributing)

dlang.org.ddoc

@@ -268,9 +268,9 @@ $(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_DIVIDER https://forum.dlang.org, Forums)
     $(SUBMENU_LINK irc://irc.libera.chat/d, IRC)
-    $(SUBMENU_LINK https://discord.gg/bMZk9Q4, Community Discord)
     $(SUBMENU_LINK https://wiki.dlang.org, Wiki)
     $(SUBMENU_LINK_DIVIDER $(ROOT_DIR)bugstats.html, Issues)
     $(SUBMENU_LINK $(ROOT_DIR)contributing.html, Contributing)