feat(formacoes): módulo 2 (DHT22 + LCD 16x2 no Wokwi), PDFs e página de entrada

- Formação 2 da LASER: slides visuais, apostila, projeto do Wokwi e scanner
  I2C, validados no simulador (leitura normal, temperatura negativa e sensor
  desconectado). Circuito com pull-ups de 10 kΩ e 4,7 kΩ para 3V3 e aviso
  sobre os pull-ups de 5 V da plaquinha PCF8574.
- PDFs prontos dos slides e das apostilas dos módulos 1 e 2;
  slides-pdf agora também exporta a apostila.
- Página de entrada em /formacoes e /formacoes/N, gerada por
  scripts/formacoes-viewer.mjs a partir do formacao.json de cada pasta.
- A apostila passou de index.html para apostila.html.
- Corrige o link do Fritzing da apostila 1 (/apostilas/1 não existe).

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

public/formacoes/2/wokwi/diagram.json

@@ -0,0 +1,183 @@
+{
+  "version": 1,
+  "author": "Lucas Rayan Guerra",
+  "editor": "wokwi",
+  "parts": [
+    {
+      "type": "board-esp32-s3-devkitc-1",
+      "id": "esp",
+      "top": 0,
+      "left": 0,
+      "attrs": {}
+    },
+    {
+      "type": "wokwi-dht22",
+      "id": "dht",
+      "top": 15,
+      "left": -250,
+      "attrs": {
+        "temperature": "26.5",
+        "humidity": "62"
+      }
+    },
+    {
+      "type": "wokwi-lcd1602",
+      "id": "lcd",
+      "top": 320,
+      "left": -60,
+      "attrs": {
+        "pins": "i2c"
+      }
+    },
+    {
+      "type": "wokwi-resistor",
+      "id": "r_dht",
+      "top": 9,
+      "left": -173,
+      "rotate": 90,
+      "attrs": {
+        "value": "10000"
+      }
+    },
+    {
+      "type": "wokwi-resistor",
+      "id": "r_sda",
+      "top": 9,
+      "left": -83,
+      "rotate": 90,
+      "attrs": {
+        "value": "4700"
+      }
+    },
+    {
+      "type": "wokwi-resistor",
+      "id": "r_scl",
+      "top": 9,
+      "left": -63,
+      "rotate": 90,
+      "attrs": {
+        "value": "4700"
+      }
+    }
+  ],
+  "connections": [
+    [
+      "esp:TX",
+      "$serialMonitor:RX",
+      "",
+      []
+    ],
+    [
+      "esp:RX",
+      "$serialMonitor:TX",
+      "",
+      []
+    ],
+    [
+      "lcd:VCC",
+      "esp:5V",
+      "red",
+      [
+        "h-20",
+        "v-100"
+      ]
+    ],
+    [
+      "lcd:GND",
+      "esp:GND.1",
+      "black",
+      [
+        "h-30",
+        "v-90"
+      ]
+    ],
+    [
+      "lcd:SDA",
+      "esp:8",
+      "blue",
+      [
+        "h-40",
+        "v-200"
+      ]
+    ],
+    [
+      "lcd:SCL",
+      "esp:9",
+      "purple",
+      [
+        "h-50",
+        "v-170"
+      ]
+    ],
+    [
+      "dht:VCC",
+      "r_dht:1",
+      "red",
+      [
+        "v12",
+        "h-25",
+        "v-159",
+        "h100"
+      ]
+    ],
+    [
+      "dht:SDA",
+      "esp:12",
+      "gold",
+      [
+        "v77"
+      ]
+    ],
+    [
+      "dht:GND",
+      "esp:GND.1",
+      "black",
+      [
+        "v118"
+      ]
+    ],
+    [
+      "r_dht:1",
+      "esp:3V3.1",
+      "red",
+      []
+    ],
+    [
+      "r_dht:2",
+      "esp:12",
+      "gold",
+      [
+        "v181"
+      ]
+    ],
+    [
+      "r_sda:1",
+      "esp:3V3.1",
+      "red",
+      []
+    ],
+    [
+      "r_sda:2",
+      "esp:8",
+      "blue",
+      [
+        "v124"
+      ]
+    ],
+    [
+      "r_scl:1",
+      "esp:3V3.1",
+      "red",
+      []
+    ],
+    [
+      "r_scl:2",
+      "esp:9",
+      "purple",
+      [
+        "v152"
+      ]
+    ]
+  ],
+  "dependencies": {}
+}