Revert "Calibre web widget (#1829)"

This reverts commit 4c49767a0f.

src/widgets/widgets.js

@@ -6,7 +6,6 @@ import autobrr from "./autobrr/widget";
 import azuredevops from "./azuredevops/widget";
 import bazarr from "./bazarr/widget";
 import caddy from "./caddy/widget";
-import calibreweb from "./calibreweb/widget";
 import changedetectionio from "./changedetectionio/widget";
 import channelsdvrserver from "./channelsdvrserver/widget";
 import cloudflared from "./cloudflared/widget";
@@ -104,7 +103,6 @@ const widgets = {
   azuredevops,
   bazarr,
   caddy,
-  calibreweb,
   changedetectionio,
   channelsdvrserver,
   cloudflared,