Revert "Calibre web widget (#1829)"

This reverts commit 4c49767a0f.

src/widgets/components.js

@@ -9,7 +9,6 @@ const components = {
   azuredevops: dynamic(() => import("./azuredevops/component")),
   bazarr: dynamic(() => import("./bazarr/component")),
   caddy: dynamic(() => import("./caddy/component")),
-  calibreweb: dynamic(() => import("./calibreweb/component")),
   changedetectionio: dynamic(() => import("./changedetectionio/component")),
   channelsdvrserver: dynamic(() => import("./channelsdvrserver/component")),
   cloudflared: dynamic(() => import("./cloudflared/component")),