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docs/packer.md

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 A [packer image](https://packer.io) is way to initialize a new cloud system with an operating system and
 software and files pre-installed. This is an oversimplified explanation but will suffice for our current needs.
  
-Before packer images, we launched Bubbles onto "blank" Ubuntu 20.04 systems and then did
+Before packer images, we launched Bubbles onto "blank" Ubuntu systems and then did
 tons of installation and configuration. It took 20+ minutes to launch a new Bubble.
 
-We decided we could do better. Packer allows us to create Ubuntu 20.04 images that already have 
+We decided we could do better. Packer allows us to create Ubuntu images that already have 
 PostgreSQL, Redis and nginx installed and configured, and lots more.
 
 Launching a Bubble is now faster (usually 10 minutes or less) because all the standard software