remove about/working-groups (#4806)

The working groups page is not needed, probably out of place under
"about", and (most importantly) duplicates material in the TSC repo but
is out of date. (The Undici WG is not in the page, for example.) Let
there be just one source of truth, which is the TSC repo.

Author: Trott

locale/ar/about/working-groups.md

@@ -42,10 +42,6 @@
       "link": "about/governance",
       "text": "الحوكمة"
     },
-    "workinggroups": {
-      "link": "about/working-groups",
-      "text": "مجموعات العمل"
-    },
     "releases": {
       "link": "about/releases",
       "text": "الاصدارات"

locale/ar/site.json

@@ -38,10 +38,6 @@
       "link": "about/governance",
       "text": "Govern"
     },
-    "workinggroups": {
-      "link": "about/working-groups",
-      "text": "Grups de Treball"
-    },
     "releases": {
       "link": "about/releases",
       "text": "Versions"

locale/ca/site.json

@@ -39,10 +39,6 @@
       "link": "about/governance",
       "text": "Governance"
     },
-    "workinggroups": {
-      "link": "about/working-groups",
-      "text": "Arbeitskreise"
-    },
     "releases": {
       "link": "about/releases",
       "text": "Versionen"