Fix URLs for nvm

Author: ehmicky

docs/1_development_environment/node_setup.md

@@ -4,8 +4,8 @@ Installers for each major OS are available on the
 [Node.js website](https://nodejs.org/en/download).
 
 To install, switch and update Node.js versions
-[`nvm`](https://github.com/creationix/nvm) can be used on Linux/Mac. It
-[does not support Windows](https://github.com/creationix/nvm/issues/284) but
+[`nvm`](https://github.com/nvm-sh/nvm) can be used on Linux/Mac. It
+[does not support Windows](https://github.com/nvm-sh/nvm/issues/284) but
 [`nvm-windows`](https://github.com/coreybutler/nvm-windows),
 [`nvs`](https://github.com/jasongin/nvs) and
 [`ps-nvm`](https://github.com/aaronpowell/ps-nvm) (for PowerShell) are

docs/summary.md

@@ -8,7 +8,7 @@
 - Test each OS with
   [virtual machines](https://en.wikipedia.org/wiki/Virtual_machine) and
   [continuous integration](https://en.wikipedia.org/wiki/Continuous_integration).
-- Instead of [`nvm`](https://github.com/creationix/nvm), use
+- Instead of [`nvm`](https://github.com/nvm-sh/nvm), use
   [`nvm-windows`](https://github.com/coreybutler/nvm-windows) and
   [`npm-windows-upgrade`](https://github.com/felixrieseberg/npm-windows-upgrade)
   on Windows.