Install commands in README copies the % sign when you use copy button

[pllim]

In https://github.com/astropy/astropy-workshop/blob/main/00-Install_and_Setup/README.md , when user use the copy icon/button (right side of the command line), it also copies the %, which would cause error on the terminal.

Example: % conda info

Desired outcome:

a. Remove % from the examples, OR b. Have some magic so the copy icon/button ignores the % on copy.

cc @mwcraig @eteq