teams: Add maintainers.

People seem to like etc/teams.scm, I think viewing the maintainers as a team
makes sense, even if I don't think trying to treat "teams" as a formal system
is useful.

* etc/teams.scm (maintainers): Describe it.
("Efraim Flashner", "Mathieu Othacehe", "Maxim Cournoyer", "Tobias
Geerinckx-Rice"): Record as in the maintainers team.

Change-Id: I4823f6e34253a327bbb790209f0385321d6dec45

etc/teams.scm

@@ -538,6 +538,13 @@ of Rebar and Mix build systems and Hex.pm importer."
         "We focus on collaboration, project growth and future (social)
 challenges"))
 
+(define-team maintainers
+  (team 'maintainers
+        #:name "Maintainers"
+        #:description
+        "Looking after project policies, commit access and code of conduct
+reports."))
+
 (define-team core
   (team 'core
         #:name "Core / Tools / Internals"
@@ -1286,7 +1293,7 @@ the \"texlive\" importer."
 (define-member (person "Tobias Geerinckx-Rice"
                        "me@tobias.gr"
                        "nckx")
-  mentors)
+  maintainers mentors)
 
 (define-member (person "Steve George"
                        "steve@futurile.net"
@@ -1301,7 +1308,7 @@ the \"texlive\" importer."
 (define-member (person "Efraim Flashner"
                        "efraim@flashner.co.il"
                        "efraim")
-  embedded bootstrap release rust)
+  maintainers embedded bootstrap release rust)
 
 (define-member (person "jgart"
                        "jgart@dismail.de"
@@ -1326,7 +1333,7 @@ the \"texlive\" importer."
 (define-member (person "Mathieu Othacehe"
                        "othacehe@gnu.org"
                        "mothacehe")
-  installer mentors)
+  maintainers installer mentors)
 
 (define-member (person "Florian Pelz"
                        "pelzflorian@pelzflorian.de"
@@ -1391,7 +1398,7 @@ the \"texlive\" importer."
 (define-member (person "Maxim Cournoyer"
                        "maxim@guixotic.coop"
                        "apteryx")
-  core documentation electronics gnome qt telephony)
+  maintainers core documentation electronics gnome qt telephony)
 
 (define-member (person "Katherine Cox-Buday"
                        "cox.katherine.e+guix@gmail.com"