Updated `README.md`
Updated `README.md`

Changed `png` to `svg` to look cooler. Also changed links to follow similar format.
romul/ex_admin,smpallen99/ex_admin,Kociamber/ex_admin,kleinernik/ex_admin,whitepaperclip/ex_admin,romul/ex_admin,whitepaperclip/ex_admin,smpallen99/ex_admin,Kociamber/ex_admin,kleinernik/ex_admin