Extract starter projects into a separate doc page

dev-contributing.txt should focus on the contribution processes and
starter projects are unrelated, hence extract them to a separate page.

Signed-off-by: Edwin Kempin <ekempin@google.com>
Change-Id: I917a145af28498799c99ee65fd918a6adad78f40

Documentation/dev-community.txt

@@ -24,6 +24,7 @@ Gerrit is developed as a self-hosting open source project:
 * link:dev-contributing.html[Contributing to Gerrit]
 * link:dev-readme.html[Developer Setup]
 * link:dev-crafting-changes.html[Crafting Changes]
+* link:dev-starter-projects.html[Starter Projects]
 
 [[plugin-development]]
 == Plugin Development

Documentation/dev-contributing.txt

@@ -37,14 +37,6 @@ Reviewers don't want to seem like nags and pester you if you
 haven't replied or made a fix, so it helps them know if you
 missed it or decided against it.
 
-== Finding starter projects to work on
-
-We have created a
-link:https://bugs.chromium.org/p/gerrit/issues/list?can=2&q=label%3AStarterProject[StarterProject]
-category in the issue tracker and try to assign easy hack projects to it. If in
-doubt, do not hesitate to ask on the developer
-link:https://groups.google.com/forum/#!forum/repo-discuss[mailing list].
-
 GERRIT
 ------
 Part of link:index.html[Gerrit Code Review]

Documentation/dev-starter-projects.txt

@@ -0,0 +1,14 @@
+= Gerrit Code Review - Starter Projects
+
+We have created a
+link:https://bugs.chromium.org/p/gerrit/issues/list?can=2&q=label%3AStarterProject[StarterProject]
+category in the issue tracker and try to assign easy hack projects to it. If in
+doubt, do not hesitate to ask on the developer
+link:https://groups.google.com/forum/#!forum/repo-discuss[mailing list].
+
+GERRIT
+------
+Part of link:index.html[Gerrit Code Review]
+
+SEARCHBOX
+---------