optimize png images using zopflipng

[PeterDaveHello]

Use Google's zopflipng to re-compress the png images losslessly as below:

 src/static/images/favicons/android-chrome-144x144.png       | Bin 8118 -> 5790 bytes
 src/static/images/favicons/android-chrome-192x192.png       | Bin 11083 -> 7945 bytes
 src/static/images/favicons/android-chrome-36x36.png         | Bin 1867 -> 1298 bytes
 src/static/images/favicons/android-chrome-48x48.png         | Bin 2550 -> 1768 bytes
 src/static/images/favicons/android-chrome-72x72.png         | Bin 3866 -> 2708 bytes
 src/static/images/favicons/android-chrome-96x96.png         | Bin 5256 -> 3702 bytes
 src/static/images/favicons/apple-touch-icon-114x114.png     | Bin 6493 -> 4576 bytes
 src/static/images/favicons/apple-touch-icon-120x120.png     | Bin 6943 -> 4887 bytes
 src/static/images/favicons/apple-touch-icon-144x144.png     | Bin 8340 -> 5933 bytes
 src/static/images/favicons/apple-touch-icon-152x152.png     | Bin 8853 -> 6243 bytes
 src/static/images/favicons/apple-touch-icon-180x180.png     | Bin 10645 -> 7586 bytes
 src/static/images/favicons/apple-touch-icon-57x57.png       | Bin 3122 -> 2177 bytes
 src/static/images/favicons/apple-touch-icon-60x60.png       | Bin 3304 -> 2311 bytes
 src/static/images/favicons/apple-touch-icon-72x72.png       | Bin 3978 -> 2775 bytes
 src/static/images/favicons/apple-touch-icon-76x76.png       | Bin 4191 -> 2954 bytes
 src/static/images/favicons/apple-touch-icon-precomposed.png | Bin 12097 -> 8359 bytes
 src/static/images/favicons/apple-touch-icon.png             | Bin 10645 -> 7586 bytes
 src/static/images/favicons/favicon-16x16.png                | Bin 1464 -> 653 bytes
 src/static/images/favicons/favicon-194x194.png              | Bin 20857 -> 13273 bytes
 src/static/images/favicons/favicon-32x32.png                | Bin 2670 -> 1554 bytes
 src/static/images/favicons/favicon-96x96.png                | Bin 9940 -> 5775 bytes
 src/static/images/favicons/mstile-144x144.png               | Bin 12429 -> 9216 bytes
 src/static/images/favicons/mstile-150x150.png               | Bin 11486 -> 8593 bytes
 src/static/images/favicons/mstile-310x150.png               | Bin 12195 -> 9393 bytes
 src/static/images/favicons/mstile-310x310.png               | Bin 27274 -> 21800 bytes
 src/static/images/favicons/mstile-70x70.png                 | Bin 8009 -> 5863 bytes
 vendor/gopkg.in/macaron.v1/macaronlogo.png                  | Bin 88924 -> 70274 bytes

[cnam]

Hello @PeterDaveHello please create pull request on gitlab.com https://gitlab.com/leanlabsio/kanban and remove: vendor/gopkg.in/macaron.v1/macaronlogo.png

[PeterDaveHello]

Hi @cnam, thanks for your reply, don't you accept PR on GitHub anymore?

[cnam]

Hello @PeterDaveHello we accept pull request only gitlab.com, because main repository there.