chore: relicense shell package as MIT

Folks are welcome to use the shell code in their projects.

README.md

@@ -63,7 +63,7 @@ Load unpacked extensions into `./extensions` then launch the browser.
 
 ## License
 
-GPL-3
+Most packages in this project use MIT with the exception of electron-chrome-extensions.
 
 For proprietary use, please [contact me](mailto:sam@samuelmaddock.com?subject=electron-browser-shell%20license) or [sponsor me on GitHub](https://github.com/sponsors/samuelmaddock/) under the appropriate tier to [acquire a proprietary-use license](https://github.com/samuelmaddock/electron-browser-shell/blob/master/LICENSE-PATRON.md). These contributions help make development and maintenance of this project more sustainable and show appreciation for the work thus far.
 

packages/shell/README.md

@@ -6,4 +6,4 @@ A `WebContentsView` is used for tab contents due to its stability for browsing r
 
 ## License
 
-GPL-3
+MIT

packages/shell/package.json

@@ -11,7 +11,7 @@
     "package": "electron-forge package",
     "make": "electron-forge make"
   },
-  "license": "GPL-3.0",
+  "license": "MIT",
   "author": "Samuel Maddock <sam@samuelmaddock.com>",
   "private": true,
   "dependencies": {