refactor(build): use dmgbuild to create dmgs (#1664)

* refactor(appdmg): make dmgs with dmgbuild

* fix(appdmg.sh): typo

* refactor(appdmg.sh): don't generate config on the fly

* fix(dmgbuild): icon file

* fix(gitignore): dmgbuild settings

* chore(resources): update readme with new files

* chore(resources/macos): add missing newline

.github/workflows/release.yml

@@ -185,8 +185,8 @@ jobs:
         uses: actions/setup-python@v2
         with:
           python-version: 3.9
-      - name: Install appdmg
-        run: cd ~; npm i appdmg; cd -
+      - name: Install dmgbuild
+        run: pip install dmgbuild
       - name: Prepare DMG Images
         run: |
           mkdir -p dmgs-addons dmgs-normal