docs: add Troubleshooting section to README#101
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Covers the most common failure modes reported or noted in code comments: LCD contrast adjustment, perpetual "Connecting..." state, I2C not detected, NeoPixel ring dark/flickering, email alerts not sending, and systemd service failing to start. Each entry lists symptoms, the relevant log command, and the fix. Closes #28 https://claude.ai/code/session_01VdFLjQPRxkWMY96TZBNHKp
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Summary
Adds a Troubleshooting section to README.md covering the most common failure modes when setting up WeatherDisplay on a Pi.
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Test plan
Closes #28