- Linting (ESLint): Simplify regexes

- npm: Update scripts to reflect removal of `all_tests.html`;
  remove `browser-test` script
- npm: Update devDeps

dist/jspdf.plugin.svgToPdf.js

@@ -265,7 +265,7 @@
       });
     }
   }, {
-    re: /^(\w{1})(\w{1})(\w{1})$/,
+    re: /^(\w)(\w)(\w)$/,
     // re: /^(?<r>\w{1})(?<g>\w{1})(?<b>\w{1})$/,
     example: ['#fb0', 'f0f'],
     process: function process(_) {