Remove _local storage_ from fabxc's responsibilities again

This is just for now, as fabxc doesn't seem to be available to agree
to his new role. Just revert this commit once he has.

MAINTAINERS.md

@@ -1,6 +1,6 @@
 Maintainers of this repository with their focus areas:
 
 * Brian Brazil <brian.brazil@robustperception.io> @brian-brazil: Console templates; semantics of PromQL, service discovery, and relabeling.
-* Fabian Reinartz <fabian.reinartz@coreos.com> @fabxc: Local storage; PromQL parsing and evaluation; implementation of retrieval, alert notification, and service discovery.
+* Fabian Reinartz <fabian.reinartz@coreos.com> @fabxc: PromQL parsing and evaluation; implementation of retrieval, alert notification, and service discovery.
 * Julius Volz <julius.volz@gmail.com> @juliusv: Remote storage integrations; web UI.