Publish Vulpes Preview 15 sources for desktop, Android and Tundra

Share Gaia assets and adapters, keep private profiles and development documents local, and update both public READMEs.

gaia/dev_apps/test-keyboard-app/style/icons/ICON.txt

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+Icon attributed to:
+https://commons.wikimedia.org/wiki/File:High-contrast-input-keyboard.svg

gaia/dev_apps/test-keyboard-app/style/keyboard.css

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+html {
+  font-size: 10px;
+  pointer-events: none;
+}
+
+body {
+  margin: 0;
+}
+
+#keyboard {
+  width: 100%;
+  height: 20rem;
+  position: absolute;
+  bottom: 0;
+  background-color: rgba(0, 0, 0, 0.5);
+  pointer-events: auto;
+}
+
+.key {
+  background-color: #333;
+  font-size: 2.4rem;
+  border: 0.2rem solid gray;
+  color: white;
+  margin: 0.2rem;
+}