docs: update docs entry point with better quickstart content
docs: update docs entry point with better quickstart content

This teaches you to use generated npm_package_bin rules rather than getting into details about writing custom rules with nodejs_binary

Fixes #1727

bazelbuild/rules_nodejs,bazelbuild/rules_nodejs,alexeagle/rules_nodejs,bazelbuild/rules_nodejs,alexeagle/rules_nodejs,bazelbuild/rules_nodejs,alexeagle/rules_nodejs,alexeagle/rules_nodejs,bazelbuild/rules_nodejs