Remove unused images and fonts from web app (#25047)

* Remove unused images from web app

* Remove unused fonts from web app

webapp/channels/webpack.config.js

@@ -171,10 +171,8 @@ var config = {
                 {from: 'src/images/emoji', to: 'emoji'},
                 {from: 'src/images/img_trans.gif', to: 'images'},
                 {from: 'src/images/logo-email.png', to: 'images'},
-                {from: 'src/images/circles.png', to: 'images'},
                 {from: 'src/images/favicon', to: 'images/favicon'},
                 {from: 'src/images/appIcons.png', to: 'images'},
-                {from: 'src/images/warning.png', to: 'images'},
                 {from: 'src/images/logo-email.png', to: 'images'},
                 {from: 'src/images/browser-icons', to: 'images/browser-icons'},
                 {from: 'src/images/cloud', to: 'images'},
@@ -185,13 +183,10 @@ var config = {
                 {from: 'src/images/forgot_password_illustration.png', to: 'images'},
                 {from: 'src/images/invite_illustration.png', to: 'images'},
                 {from: 'src/images/channel_icon.png', to: 'images'},
-                {from: 'src/images/add_payment_method.png', to: 'images'},
-                {from: 'src/images/add_subscription.png', to: 'images'},
                 {from: 'src/images/c_avatar.png', to: 'images'},
                 {from: 'src/images/c_download.png', to: 'images'},
                 {from: 'src/images/c_socket.png', to: 'images'},
                 {from: 'src/images/admin-onboarding-background.jpg', to: 'images'},
-                {from: 'src/images/payment-method-illustration.png', to: 'images'},
                 {from: 'src/images/cloud-laptop.png', to: 'images'},
                 {from: 'src/images/cloud-laptop-error.png', to: 'images'},
                 {from: 'src/images/cloud-laptop-warning.png', to: 'images'},