Refactor entire Go codebase (#32)

- Small UI adjustments
- Only show last 2 previous IP addresses in notifications and UI
- Database uses interfaces to be modular/pluggable in order to move away from sqlite
- Less dependencies, it even uses a switch statement instead of httprouter
- Updated golibs
- Changed default logging format to `console` (zap)
- Better code overall, modular updater and trigger system
- Refactored readme
- CI script improved

docker-compose.yml

@@ -9,10 +9,13 @@ services:
     volumes:
       - ./data:/updater/data
     environment:
-      - DELAY=300
-      - ROOTURL=
+      - DELAY=300s
+      - ROOT_URL=/
       - LISTENINGPORT=8000
-      - LOGGING=human
-      - NODEID=0
-      - LOGLEVEL=
+      - LOG_ENCODING=console
+      - LOG_LEVEL=info
+      - NODE_ID=0
+      - HTTP_TIMEOUT=10s
+      - GOTIFY_URL=
+      - GOTIFY_TOKEN=
     restart: always