Fix slow ZSH startup due to NVM
Many zsh users use oh-my-zsh in combination with the nvm plugin to use the right node version for every project, configured through .nvmrc files. This, in turn, slows the startup of your shell quite a lot. But we can easily fix this slow zsh startup! Instead of always loading your nvm autocompletion, we can command oh-my-zsh to just load nvm ressources on-demand, also known as lazy-loading.
