.bashrc.inb7: Add $HOME/.nvm setup (if present)

NVM is the NodeJS installation/version manager.

This is unchanged from the code that the NVM installer[1] adds to
~/.bashrc. It always sets $NVM_DIR even if it's not present, but we
just leave that because it's not annoying enough that we want to
use a non-standard version.

The installer script has a bug: it assumes that the user's default
remote name is `origin` and fails if it is not. PR #3654 [2] has been
filed to fix this (it just adds `-o origin` to the clone command), but
is stalled for unknown reasons.

[1]: https://nodejs.org/en/download
[2]: nvm-sh/nvm#3654

Author: 0cjs

dot/bashrc.inb7

@@ -458,6 +458,13 @@ pz() {
 [[ -r ~/co/public/gh/cynic-net/pactivate/pae ]] \
     && . ~/co/public/gh/cynic-net/pactivate/pae
 
+####################################################################
+#   `nvm` is the NodeJS install tool
+
+export NVM_DIR="$HOME/.nvm"
+[ -s "$NVM_DIR/nvm.sh" ] && \. "$NVM_DIR/nvm.sh"
+[ -s "$NVM_DIR/bash_completion" ] && \. "$NVM_DIR/bash_completion"
+
 ######################################################################
 #   Haskell Configuration