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/tv_apps/fling-tutorial/style/index.css

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+html {
+  font-size: 10px;
+  /* We have Fira Sans as default font in real device. But it isn't default in
+   * browser. That's the main reason this line is here.*/
+  font-family: "Fira Sans";
+  font-weight: 100;
+  font-style: italic;
+}
+
+html, body {
+  width: 100%;
+  height: 100%;
+  overflow: hidden;
+  margin: 0;
+  padding: 0;
+  background-color: black;
+}
+
+#moz-iframe,
+#offline-content {
+  width: 100%;
+  height: 100%;
+}
+
+#moz-iframe.hidden,
+#offline-content.hidden {
+  display: none;
+}

gaia/tv_apps/fling-tutorial/style/offline_content.css

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+#offline-content {
+  opacity: 1;
+  color: #fff;
+  background-image: url("images/background.png");
+  transition: opacity 0.1s ease;
+}
+
+#offline-content.finish {
+  opacity: 0;
+}
+
+.txt-mid {
+  font-size: 3.8rem;
+}
+
+.txt-large {
+  font-size: 7rem;
+}
+
+smart-button[type=rounded-corner-text] {
+  width: 23.7rem;
+  font-size: 2.4rem;
+  font-weight: normal;
+}
+
+.slide {
+  width: 100%;
+  height: 100%;
+  position: fixed;
+}
+
+.slide-section {
+  position: absolute;
+  margin-right: -50%;
+  left: 50%;
+  transform: translate(-50%, 0px);
+}
+
+#description-section {
+  top: 21rem;
+  text-align: center;
+}
+
+#button-section {
+  bottom: 12rem;
+}
+
+.slide-description {
+  margin: 0;
+  margin-bottom: 7.5rem;
+  padding: 0;
+}