made readme beautiful

README.md

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 # waybar
 # showcase
+
 <details open>
+
     <summary>left-side</summary>
     - workspace-button "change" on hover
     - dynamic icons on workspaces
     <br>
 
     ![waybar-left.gif](./.src/waybar-left.gif)
+
 </details>
+
 <details open>
+
     <summary>right-side</summary>
     - dynamic groups for memory/cpu/disk && powerslide-menu
     <br>
 
     ![waybar-right.gif](./.src/waybar-right.gif)
+
 </details>
+
 <details open>
+
     <summary>right-side</summary>
     - bar changes red if fullscreen is on (not the whole screen of course, but the 'light'-fullscreen mode instead)
     <br>
 
     ![waybar-middle.git](./.src/waybar-middle_bar-colors.gif)
+
 </details>
 
 ## installation