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/nightly/build.json

@@ -0,0 +1,9 @@
+{
+    "appId": "im.riot.nightly",
+    "name": "element-desktop-nightly",
+    "productName": "Element Nightly",
+    "description": "Element: the future of secure communication (nightly unstable build)",
+    "protocols": ["io.element.nightly", "element"],
+    "linux.executableName": "element-desktop-nightly",
+    "linux.deb.name": "element-nightly"
+}