[ImgBot] optimizes images

[ImgBot] optimizes images

*Total -- 289.13kb -> 211.82kb
(26.74%)/support/doc/development/server/upload-video.png -- 56.19kb ->
33.83kb (39.8%)/support/doc/development/client/components-tree.png --
31.81kb -> 19.82kb
(37.68%)/client/src/assets/images/icons/icon-512x512.png -- 14.24kb ->
9.97kb (30.03%)/server/tests/fixtures/avatar-resized.png -- 1.69kb ->
1.19kb (29.24%)/server/tests/fixtures/avatar2-resized.png -- 1.68kb ->
1.21kb (28.41%)/client/src/assets/images/default-avatar.png -- 1.63kb ->
1.24kb (23.89%)/server/tests/fixtures/avatar.png -- 1.63kb -> 1.24kb
(23.89%)/server/tests/fixtures/avatar-big.png -- 143.15kb -> 111.56kb
(22.06%)/client/src/assets/images/icons/icon-192x192.png -- 3.58kb ->
2.86kb (20.21%)/server/tests/fixtures/video_short1.webm.jpg -- 2.83kb ->
2.36kb (16.75%)/client/src/assets/images/icons/icon-144x144.png --
2.34kb -> 1.95kb (16.53%)/client/src/assets/images/icons/icon-96x96.png
-- 1.91kb -> 1.62kb
(11.93%)/client/src/assets/images/icons/icon-72x72.png -- 1.72kb ->
1.53kb (11.1%)/client/src/assets/images/icons/icon-48x48.png -- 1.18kb
-> 1.17kb (1%)