Update Check Features to check Blinka boards too

_blinka/adafruit_feather_rp2040.md

@@ -9,7 +9,6 @@ board_image: "adafruit_feather_rp2040.jpg"
 download_instructions: "https://learn.adafruit.com/circuitpython-libraries-on-any-computer-with-raspberry-pi-pico"
 date_added: 2021-12-6
 features:
-  - USB-C
   - Feather-Compatible
   - STEMMA QT/QWIIC
 ---

_blinka/adafruit_qtpy_rp2040.md

@@ -10,7 +10,6 @@ download_instructions: "https://learn.adafruit.com/circuitpython-libraries-on-an
 date_added: 2021-12-6
 features:
   - STEMMA QT/QWIIC
-  - USB-C
 ---
 
 What a cutie pie! Or is it... a QT Py? This diminutive dev board comes with one of our new favorite chip, the RP2040. It's been made famous in the new [Raspberry Pi Pico](https://www.adafruit.com/pico) *and* our [Feather RP2040](http://www.adafruit.com/product/4884) and [ItsyBitsy RP2040](http://www.adafruit.com/product/4888), but what if we wanted something really *smol?*

check-features.py

@@ -2,6 +2,7 @@
 from pathlib import Path
 import frontmatter
 
+# Check CircuitPython Download Features
 with open('template.md', "rt") as f:
     metadata, content = frontmatter.parse(f.read())
     acceptable_features = set(metadata['features'])
@@ -15,4 +16,34 @@ for filename in Path('_board').glob("*.md"):
         print(f"{filename}:0: Non-standard feature: {feature}")
         failed = True
 
+if failed:
+    print("Non-standard features found. See https://learn.adafruit.com/how-to-add-a-new-board-to-the-circuitpython-org-website/adding-to-downloads for acceptable features")
+    raise SystemExit(failed)
+
+# Check Blinka Download Features
+blinka_features = {
+    "Ethernet",
+    "HDMI",
+    "Wi-Fi",
+    "40-pin GPIO",
+    "GPS",
+    "Feather-Compatible",
+    "Bluetooth/BLE",
+    "STEMMA QT/QWIIC",
+    "USB 3.0",
+    "Infrared Receiver",
+}
+
+failed = False
+for filename in Path('_blinka').glob("*.md"):
+    with open(filename, "rt") as f:
+        metadata, content = frontmatter.parse(f.read())
+    features = metadata.get('features') or ()
+    for feature in sorted(set(features) - blinka_features):
+        print(f"{filename}:0: Non-standard feature: {feature}")
+        failed = True
+
+if failed:
+    print("Non-standard features found. See https://learn.adafruit.com/how-to-add-a-new-board-to-the-circuitpython-org-website/adding-to-blinka for acceptable features")
+
 raise SystemExit(failed)