feat: define node version in .nvmrc file (#789)

Co-authored-by: Dominik Pschenitschni <mail@celement.de>
Reviewed-on: https://kolaente.dev/vikunja/frontend/pulls/789
Co-authored-by: dpschen <dpschen@noreply.kolaente.de>
Co-committed-by: dpschen <dpschen@noreply.kolaente.de>

.editorconfig

@@ -19,4 +19,7 @@ indent_size = 2
 
 [*.json]
 indent_style = space
-indent_size = 2
+indent_size = 2
+
+[.nvmrc]
+insert_final_newline = false

.nvmrc

@@ -0,0 +1 @@
+v16