Create index.md for an overall table of contents

docs/index.md

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+# Cleanflight Documentation
+
+Getting started:
++ [Introduction](Introduction.md)
++ [Installation](Installation.md)
++ [Migrating from Baseflight](Migrating from baseflight.md)
++ [Configuration](Configuration.md)
++ [Safety!](Safety.md)
+
+Hardware support:
++ [Boards](Boards.md)
+  + [AlienWii32](Board - AlienWii32.md), [CC3D](Board - CC3D.md), [CJMCU](Board - CJMCU.md), 
+          [ChebuzzF3](Board - ChebuzzF3.md), [Naze32](Board - Naze32.md), [Olimexino](Board - Olimexino.md),
+          [Sparky](Board - Sparky.md)
++ [GPS](Gps.md)
++ [Battery](Battery.md)
++ [Buzzer](Buzzer.md)
++ [Displays](Display.md)
++ [LED strip](LedStrip.md)
++ [Oneshot](Oneshot.md)
++ [Receivers](Rx.md)
++ [RSSI](RSSI.md)
++ [Serial port](Serial.md)
++ [Sonar](Sonar.md)
++ [Telemetry](Telemetry.md)
+
+Configuring and tuning:
++ [Configuration](Configuation.md)
++ [Command Line Interface (CLI)](Cli.md)
++ [Autotune](Autotune.md)
++ [Inflight Adjustments](Inflight adjustments.md)
++ [Flight modes](Modes.md)
++ [PID Tuning](PID tuning.md)
++ [Blackbox](Blackbox.md) (logging)
++ [Controls](Controls.md)
++ [Mixer](Mixer.md)
++ [Profiles](Profiles.md)
+
+
+