feat: type the plugin host record, move plugin strings out of core and add lint checks

plugins/tmux-monitor/locales/en.json

@@ -2,7 +2,8 @@
   "hosts": {
     "enableTmuxMonitor": "Enable Tmux Monitor",
     "enableTmuxMonitorDesc": "Show this host in the Tmux Monitor and add its tmux actions to the sidebar",
-    "tabTmuxMonitor": "Tmux Monitor"
+    "tabTmuxMonitor": "Tmux Monitor",
+    "docsLink": "View docs"
   },
   "nav": {
     "tmuxMonitor": "Tmux Monitor"