Safer learning mode asking for confirmation

**Is your feature request related to a problem? Please describe.**

I have written about lazygit in [ 15 Command Line Tools which Spark Joy in Your Terminal ](https://dev.to/jmfayard/15-command-line-tools-which-spark-joy-in-your-terminal-45ln) but I'm still a bit afraid to use it.

It takes time to learn the shortcuts with confidence, and in the meantime I could be git messing stuff by not using the right shortcut on my keyboard.

**Describe the solution you'd like**

I would like a learning mode where if you press a keyboard shortcut, it tells you what it's about to do and you have to press enter for confirmation. We could make it a bit fancier so that if you use it already 5 times the confirmation is not necessary anymore.

**Describe alternatives you've considered**

Learning all shortcuts at once and remembering them perfectly. Alas I'm just a human