All components page: Update component illustrations

[andrew-ronaldson]

Follow up to patternfly/patternfly-design#1301

Goal is to replace the visuals with something more inline with v6 visual updates. This work includes some minor design updates to the layout and page content. See mocks for details

[bekah-stephens]

Here's the link to the updated illustrations - both light and dark (PNGs): https://drive.google.com/drive/folders/1oseJuG1fW2goTXTHNlRBAGMPu0713K9R