git-maintenance: add page (#5463)

* git-maintenance: add page

* Apply suggestions from code review

Co-authored-by: bl-ue <54780737+bl-ue@users.noreply.github.com>

* Update pages/common/git-maintenance.md

Co-authored-by: bl-ue <54780737+bl-ue@users.noreply.github.com>

* Update pages/common/git-maintenance.md

Co-authored-by: bl-ue <54780737+bl-ue@users.noreply.github.com>

Co-authored-by: bl-ue <54780737+bl-ue@users.noreply.github.com>

pages/common/git-maintenance.md

@@ -0,0 +1,24 @@
+# git-maintenance
+
+> Run tasks to optimize Git repository data.
+> More information: <https://git-scm.com/docs/git-maintenance>.
+
+- Register the current repository in the user's list of repositories to daily have maintenance run:
+
+`git maintenance register`
+
+- Start running maintenance on the current repository:
+
+`git maintenance start`
+
+- Halt the background maintenance schedule for the current repository:
+
+`git maintenance stop`
+
+- Remove the current repository from the user's maintenance repository list:
+
+`git maintenance unregister`
+
+- Run a specific maintenance task on the current repository:
+
+`git maintenance run --task={{commit-graph|gc|incremental-repack|loose-objects|pack-refs|prefetch}}`