Improve keyboard button visibility in before-we-start

[ragamouf]

Currently, the keyboard tags on the Ctrl key, Enter key, Cmd key all look black, or extremely dark grey. The text is also black. I don't think this is on purpose, and looking in the code there are backticks "`" which enclose the keyboard button text. Removing these backticks will hopefully allow the text to appear white, and visible on the screen.

The screenshot below shows what I see on my google chrome browser on a mac.

I checked the code below and noticed that there were no backticks around the "F1" button.

[github-actions[bot]]

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