feat: add Arduino Uno, ESP32 PCB and LED Letter tutorials

[singhaditya21]

This PR adds three new tutorials to the documentation to resolve the open bounties on the archived docs-old repository:

1. Arduino Uno Schematic (Closes Create Arduino Uno (Schematic Only) docs-old#42 / /claim Create Arduino Uno (Schematic Only) docs-old#42)

   • Adds docs/tutorials/arduino-uno-schematic.mdx
   • Details the full schematic layout for the Arduino Uno, including ATmega328P, ATmega16U2, USB Type-B port, crystal oscillators, power decoupling, and pin headers, using the routingDisabled property.

2. ESP32 PCB Layout and Routing (Closes ESP32 PCB Layout and Routing docs-old#44 / /claim ESP32 PCB Layout and Routing docs-old#44)

   • Adds docs/tutorials/esp32-pcb-routing.mdx
   • Details how to lay out and route an ESP32 board on a 2-layer PCB, placing the decoupling capacitors, crystal oscillator, flash, PSRAM, and antenna with best-practice placement rules.

3. Draw Any Letter with LEDs (Closes Draw any letter with LEDs docs-old#50 / /claim Draw any letter with LEDs docs-old#50)

   • Adds docs/tutorials/draw-any-letter-leds.mdx
   • Implements a custom, math-driven <LedLetter /> component that dynamically maps capital letters A-Z to a 5x7 grid of 0603 SMD LEDs and current-limiting resistors, scaling positions mathematically on both PCB and schematic.

All three MDX pages have been compiled successfully via Docusaurus production build (bun run build).

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Project	Deployment	Actions	Updated (UTC)
docs	Ready	Preview, Comment	Jun 15, 2026 4:58am