* Replace angular-cli patch with something less risky

* path.join() is needed, provide a naive implementation

* technically, webpack provided a polyfill for Buffer, we should too

* process polyfill matches webpack; peertube depends on nextTick

* polyfill for path to match webpack

* http/https polyfills as per webpack

was `yaml` changed to `yml`

* get videos with specific category (api)

* update api doc with category

* add url parameter to filter by category

* fix lint issues