Move assets to public/assets folder, remove from gitignore, update paths

Author: brandongregoryscott

.gitignore

@@ -23,5 +23,3 @@ yarn-error.log*
 
 .yalc
 yalc.lock
-
-public/assets

package.json

@@ -84,12 +84,11 @@
     "name": "beets",
     "private": true,
     "scripts": {
-        "build": "react-scripts build && npm run copy-assets",
+        "build": "react-scripts build",
         "build:migrations": "echo Building src/scripts/migrations && echo Using TypeScript && tsc -v && tsc --project src/scripts/migrations",
         "clean:generated": "rm -rf src/generated",
         "clean:migrations": "rm -rf src/scripts/migrations/dist",
         "codegen": "ts-node src/scripts/codegen/main.ts",
-        "copy-assets": "rm -rf public/assets && cp -rf src/docs/assets public/assets",
         "eject": "react-scripts eject",
         "format": "prettier --write",
         "migrations:create": "node-pg-migrate --migrations-dir src/scripts/migrations --template-file-name src/scripts/migrations/utils/migration-template.ts create",