Add desktop file and icon to meson build script

build-aux/com.lemmy-gtk.lemoa.Devel.json

@@ -1,7 +1,7 @@
 {
     "id": "com.lemmy-gtk.lemoa",
     "runtime": "org.gnome.Platform",
-    "runtime-version": "42",
+    "runtime-version": "44",
     "sdk": "org.gnome.Sdk",
     "sdk-extensions": [
         "org.freedesktop.Sdk.Extension.rust-stable",

build-aux/dist-vendor.sh

@@ -1,11 +0,0 @@
-#!/bin/bash
-export DIST="$1"
-export SOURCE_ROOT="$2"
-
-cd "$SOURCE_ROOT"
-mkdir "$DIST"/.cargo
-cargo vendor | sed 's/^directory = ".*"/directory = "vendor"/g' > $DIST/.cargo/config
-# Move vendor into dist tarball directory
-mv vendor "$DIST"
-
-