Migrate electron files to typescript (#267)

- Switches electron src files to typescript with minimum typing required
for build
- Adds webpack-merge for shared typescript build config and jsdoc types
- Minor README changes

---------

Co-authored-by: emma <hi@emma.cafe>

yarn.lock

@@ -2870,6 +2870,11 @@ flat-cache@^3.0.4:
     flatted "^3.1.0"
     rimraf "^3.0.2"
 
+flat@^5.0.2:
+  version "5.0.2"
+  resolved "https://registry.yarnpkg.com/flat/-/flat-5.0.2.tgz#8ca6fe332069ffa9d324c327198c598259ceb241"
+  integrity sha512-b6suED+5/3rTpUBdG1gupIl8MPFCAMA0QXwmljLhvCUKcUvdE4gWky9zpuGCcXHOsz4J9wPGNWq6OKpmIzz3hQ==
+
 flatted@^3.1.0:
   version "3.2.7"
   resolved "https://registry.yarnpkg.com/flatted/-/flatted-3.2.7.tgz#609f39207cb614b89d0765b477cb2d437fbf9787"
@@ -6472,6 +6477,15 @@ webpack-dev-server@^4.11.1:
     webpack-dev-middleware "^5.3.1"
     ws "^8.4.2"
 
+webpack-merge@^5.10.0:
+  version "5.10.0"
+  resolved "https://registry.yarnpkg.com/webpack-merge/-/webpack-merge-5.10.0.tgz#a3ad5d773241e9c682803abf628d4cd62b8a4177"
+  integrity sha512-+4zXKdx7UnO+1jaN4l2lHVD+mFvnlZQP/6ljaJVb4SZiwIKeUnrT5l0gkT8z+n4hKpC+jpOv6O9R+gLtag7pSA==
+  dependencies:
+    clone-deep "^4.0.1"
+    flat "^5.0.2"
+    wildcard "^2.0.0"
+
 webpack-merge@^5.7.3:
   version "5.8.0"
   resolved "https://registry.yarnpkg.com/webpack-merge/-/webpack-merge-5.8.0.tgz#2b39dbf22af87776ad744c390223731d30a68f61"