feat: add app hello-world

apps/hello-world/config.json

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+{
+  "$schema": "../schema.json",
+  "name": "Hello World",
+  "available": true,
+  "exposable": true,
+  "port": 8000,
+  "id": "hello-world",
+  "tipi_version": 1,
+  "version": "1.0.0",
+  "categories": [
+    "utilities"
+  ],
+  "description": "Hello World web server in under 2 MB",
+  "short_desc": "Hello World web server in under 2 MB",
+  "author": "crccheck",
+  "source": "https://github.com/crccheck/docker-hello-world",
+  "form_fields": []
+}

apps/hello-world/docker-compose.yml

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+version: '3.7'
+services:
+  hello-world:
+    container_name: hello-world
+    image: crccheck/hello-world
+    restart: unless-stopped
+    ports:
+      - ${APP_PORT}:8000
+    networks:
+      - tipi_main_network
+    labels:
+      traefik.enable: ${APP_EXPOSED}
+      traefik.http.routers.hello-world.rule: Host(`${APP_DOMAIN}`)
+      traefik.http.routers.hello-world.entrypoints: websecure
+      traefik.http.routers.hello-world.service: hello-world
+      traefik.http.routers.hello-world.tls.certresolver: myresolver
+      traefik.http.services.hello-world.loadbalancer.server.port: 7575

apps/hello-world/metadata/description.md

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+# Hello World
+Tiny app that prints "Hello World" in the browser. Can be used to test the deployment of a new app.