[ImgBot] Optimize images

[imgbot[bot]]

Beep boop. Your images are optimized!

Your image file size has been reduced by 22% 🎉

Details

File	Before	After	Percent reduction
/docs/images/manageRoles.png	250.47kb	193.59kb	22.71%
/docs/images/manageAndAssignRoles.png	52.91kb	43.53kb	17.72%
/src/main/webapp/images/pencil.svg	1.33kb	1.21kb	9.51%
Total :	304.71kb	238.32kb	21.79%

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