Documentation/index.md: Add "Community" menu entry

Clean up the main menu by adding a new entry `Community` and moving all
related menu entries below it.

Change-Id: Ib5df0156edaa739f15e6da8489968448876e1894
Signed-off-by: Felix Singer <felixsinger@posteo.net>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/62219
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Paul Menzel <paulepanter@mailbox.org>
Reviewed-by: Arthur Heymans <arthur@aheymans.xyz>
Reviewed-by: Angel Pons <th3fanbus@gmail.com>
diff --git a/Documentation/community/index.md b/Documentation/community/index.md
new file mode 100644
index 0000000..30420ae
--- /dev/null
+++ b/Documentation/community/index.md
@@ -0,0 +1,7 @@
+# Community
+
+* [Code of Conduct](code_of_conduct.md)
+* [Language style](language_style.md)
+* [Community forums](forums.md)
+* [Project services](services.md)
+* [coreboot at conferences](conferences.md)
diff --git a/Documentation/index.md b/Documentation/index.md
index 61ae05f..1130513 100644
--- a/Documentation/index.md
+++ b/Documentation/index.md
@@ -172,11 +172,7 @@
 * [Project Ideas](contributing/project_ideas.md)
 * [Google Summer of Code](contributing/gsoc.md)
 * [Documentation Ideas](contributing/documentation_ideas.md)
-* [Code of Conduct](community/code_of_conduct.md)
-* [Language style](community/language_style.md)
-* [Community forums](community/forums.md)
-* [Project services](community/services.md)
-* [coreboot at conferences](community/conferences.md)
+* [Community](community/index.md)
 * [Payloads](payloads.md)
 * [Distributions](distributions.md)
 * [Technotes](technotes/index.md)