config(fish): add fish completions for cli tools

dot_config/fish/functions/_nvm_version_deactivate.fish

@@ -0,0 +1,5 @@
+function _nvm_version_deactivate --argument-names ver
+    test "$nvm_current_version" = "$ver" && set --erase nvm_current_version
+    set --local index (contains --index -- $nvm_data/$ver/bin $PATH) &&
+        set --erase PATH[$index]
+end