docs: Remove outdated stm32f1.md document

The stm32f103 has become popular in the "skr mini" series of boards.
As a result, the stm32f1.md document is no longer relevant.

Signed-off-by: Kevin O'Connor <kevin@koconnor.net>

docs/Overview.md

@@ -62,8 +62,6 @@ communication with the Klipper developers.
 
 - [Bootloaders](Bootloaders.md): Developer information on
   micro-controller flashing.
-- [stm32f1](stm32f1.md): Information on the STM32F1 micro-controller
-  port.
 - [Beaglebone](beaglebone.md): Details for running Klipper on the
   Beaglebone PRU.
 - [stm32f0](stm32f0_CAN.md): Information on the STM32F0 micro-controller

docs/stm32f1.md

@@ -1,49 +0,0 @@
-This document describes how the STM32F1 port operates and how it can be used on
-STM32-based boards, such as the "Blue Pill". STM32 MCUs are not used on any
-Arduino boards, so their restrictions aren't as widely known and less straight
-forward compared to common Arduino compatible boards. There aren't any standard
-pin mappings either.
-
-General considerations
-======================
-
-The port is currently designed for and tested with STM32F103xB series
-MCUs, but it should work with any STM32F103 series MCUs with minimal
-changes.
-
-Unlike Arduino-based boards, typically there is no automatic reset on serial
-connection with STM32 boards. Please use `restart_method: command` with the
-STM32F1 port.
-
-Fixed pins
-==========
-
-When using USB, the PA11 (D-) and PA12 (D+) pins are reserved. The USB
-code assumes that PA12 (D+) has a fixed pullup resistor attached to
-it.
-
-SPI uses pins PB13/PB14/PB15, but the pins can be used as general I/O
-if SPI is not used.
-
-Digital I/O
-===========
-
-All pins that aren't part of the fixed set can be used for digital I/O. Pins are
-referred to by their primary name, e.g. `PA1`. Do not try to use Arduino pin
-aliases in your configuration. See ST's datasheets for more details. The
-[STM32Duino](http://wiki.stm32duino.com/index.php?title=Blue_Pill) wiki has more
-info on the popular "Blue Pill" board.
-
-Analog inputs
-=============
-
-All ADC-capable pins can be used as analog inputs with the same naming as
-digital I/O pins. Small packages MCUs (e.g. LFQP48) have 10 channels (PA0-PA7,
-PB0-PB1), while larger package devices have 16 channels (PA0-PA7, PB0-PB1,
-PC0-PC5).
-
-SPI
-===
-
-SPI uses pin PB13 (SCK), PB14 (MISO) and PB15 (MOSI). The clock speed range is
-0.15..18 MHz. Chip select pins do not have any restrictions.