Documentation/index.md: Add "Contributing" menu entry
Clean up the main menu by adding a new entry `Contributing` and moving
all related menu entries below it.
Change-Id: I04ec8a568b716df48ae7f8f826826e8753f5f88b
Signed-off-by: Felix Singer <felixsinger@posteo.net>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/62220
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Arthur Heymans <arthur@aheymans.xyz>
Reviewed-by: Angel Pons <th3fanbus@gmail.com>
diff --git a/Documentation/contributing/index.md b/Documentation/contributing/index.md
new file mode 100644
index 0000000..f9db1bc
--- /dev/null
+++ b/Documentation/contributing/index.md
@@ -0,0 +1,6 @@
+# Contributing
+
+* [Coding Style](coding_style.md)
+* [Project Ideas](project_ideas.md)
+* [Documentation Ideas](documentation_ideas.md)
+* [Google Summer of Code](gsoc.md)
diff --git a/Documentation/index.md b/Documentation/index.md
index 1130513..1fa29ce 100644
--- a/Documentation/index.md
+++ b/Documentation/index.md
@@ -168,10 +168,7 @@
* [Getting Started](getting_started/index.md)
* [Tutorial](tutorial/index.md)
-* [Coding Style](contributing/coding_style.md)
-* [Project Ideas](contributing/project_ideas.md)
-* [Google Summer of Code](contributing/gsoc.md)
-* [Documentation Ideas](contributing/documentation_ideas.md)
+* [Contributing](contributing/index.md)
* [Community](community/index.md)
* [Payloads](payloads.md)
* [Distributions](distributions.md)