chore: rework plugin readmes, json changelogs and standalone repo setup

plugins/wake-on-lan/CONTRIBUTING.md

@@ -0,0 +1,22 @@
+# Contributing to Wake-on-LAN
+
+## Development
+
+```bash
+npm run build      # build into dist/
+npm run test       # run this plugin's tests
+npm run typecheck  # type-check this plugin
+npm run validate   # check manifest.json
+npm run format     # format the code with Prettier
+```
+
+## Settings
+
+### Host
+
+- **MAC address:** the network card to wake
+- **Broadcast address:** where to send the packet. Leave it blank for 255.255.255.255
+
+## Permissions
+
+- `wake-on-lan.send`: send Wake-on-LAN packets. Admins and users have it by default.