Migrate to new EJS CDN, and save state tweaks (#264)

* Saved game icon now displays on game cover art in library

* Fixed casing error on save state download icon

* Migrate EJS from submodule to 7z download during docker build

* Updated README and gitignore

* Resized library search buttons

* Export to JSON now triggers the download rather than display of a formatted platform map

.github/dependabot.yml

@@ -9,9 +9,3 @@ updates:
     directory: "/" # Location of package manifests
     schedule:
       interval: "weekly"
-  - package-ecosystem: "gitsubmodule"
-    directory: "/"
-    allow:
-      - dependency-name: "gaseous-server/wwwroot/emulators/EmulatorJS"
-    schedule:
-      interval: "weekly"