Remove SCons from docs, etc.

docs/ci/appveyor.rst

@@ -143,7 +143,6 @@ same for the all projects, don't need to modify them):
         InstallPython $env:PYTHON_VERSION $env:PYTHON_ARCH $env:PYTHON_HOME
         InstallPip $env:PYTHON_HOME
         InstallPackage $env:PYTHON_HOME setuptools
-        InstallPackage $env:PYTHON_HOME scons
         InstallPackage $env:PYTHON_HOME platformio
     }
 

docs/ci/drone.rst

@@ -50,7 +50,7 @@ Please fill all fields for your project in the Drone control panel:
 
 .. code-block:: bash
 
-    python -c "$(curl -fsSL https://raw.githubusercontent.com/platformio/platformio/master/scripts/get-platformio.py)"
+    pip install -U platformio
     platformio ci --board=TYPE_1 --board=TYPE_2 --board=TYPE_N
 
 .. image:: ../_static/droneci-platformio-integration-1.png
@@ -75,7 +75,7 @@ Examples
 
 .. code-block:: bash
 
-    python -c "$(curl -fsSL https://raw.githubusercontent.com/platformio/platformio/master/scripts/get-platformio.py)"
+    pip install -U platformio
     wget https://github.com/xxxajk/spi4teensy3/archive/master.zip -O /tmp/spi4teensy3.zip
     unzip /tmp/spi4teensy3.zip -d /tmp
     platformio ci --lib="." --lib="/tmp/spi4teensy3-master" --board=uno --board=teensy31 --board=due

docs/ci/shippable.rst

@@ -55,7 +55,7 @@ GitHub repository.
         - PLATFORMIO_CI_SRC=path/to/source/directory
 
     install:
-        - python -c "$(curl -fsSL https://raw.githubusercontent.com/platformio/platformio/master/scripts/get-platformio.py)"
+        - pip install -U platformio
 
     script:
         - platformio ci --board=TYPE_1 --board=TYPE_2 --board=TYPE_N
@@ -81,7 +81,7 @@ Examples
         - PLATFORMIO_CI_SRC=examples/pl2303/pl2303_gps/pl2303_gps.ino
 
     install:
-        - python -c "$(curl -fsSL https://raw.githubusercontent.com/platformio/platformio/master/scripts/get-platformio.py)"
+        - pip install -U platformio
         - wget https://github.com/xxxajk/spi4teensy3/archive/master.zip -O /tmp/spi4teensy3.zip
         - unzip /tmp/spi4teensy3.zip -d /tmp