Experiment BT support using Chrome web serial (#920)

* plumbing

* plumbing

* logging

* more notes

* fixing typing

* more plumbing

* more plumbing

* different baud rate

* talking to the brick

* first over the air drop

* fix buffer

* tweak paraetmers

* formatting fixing double upload

* reduce console.log

* cleanup

* add BLE button to download dialog

* changed label

* recover from broken COM port

* fix function call

* reduce log level

* adding ticks

* some help

* updated support matrix

* more docs

* updated browser help

* more docs

* add link

* add device

* added image

theme/style.less

@@ -185,3 +185,8 @@
     font-family: 'legoIcons' !important;
     content: "\f119" !important;
 }
+
+.bluetooth {
+    background-color: #007EF4 !important;
+    color: white !important;
+}