Move everything to apps/desktop subdirectory

Some bits will need to be moved back out after the merge

Signed-off-by: Michael Telatynski <7t3chguy@gmail.com>

apps/desktop/element.io/release/build.json

@@ -0,0 +1,7 @@
+{
+    "appId": "im.riot.app",
+    "name": "element-desktop",
+    "productName": "Element",
+    "description": "Element: the future of secure communication",
+    "protocols": ["io.element.desktop", "element"]
+}