[Cloudflare Webworkers](https://workers.cloudflare.com/) are potentially a simple way to integrate AMP Optimizer. We should provide a worker compatible version of AMP Optimizer. Current challenges are: * We need to replace/disable all node specific dependencies (node-fetch, fs, ...) with browser compatible version. This can be done by providing a webworker specific configuration option. * Provide a minified version that stays within the maximum worker size of 1MB. * Make sure, optimization does stay within the execution time limit of 10/50ms. This might require disabling expensive transformations (CSS minification, extension auto import,...). Related: @cramforce created a [working prototype](https://github.com/cramforce/amp-toolbox-optimizer-worker) some time ago, but since then we migrated from parse5 to htmlparser2. //cc @patrickkettner