Revert "download: fix nvm instructions" (#7444)

Author: ovflowd

Diff for: apps/site/snippets/en/download/nvm.bash

@@ -1,9 +1,6 @@
 # Download and install nvm:
 curl -o- https://raw.githubusercontent.com/nvm-sh/nvm/v0.40.1/install.sh | bash
 
-# activate nvm (in lieu of restarting the shell)
-\. "${HOME}/.nvm/nvm.sh"
-
 # Download and install Node.js:
 nvm install ${props.release.major}