docs: remove obsolete removal using make uninstall (#7502)

- make uninstall is no longer possible using current source code
- Fixes #7488

Signed-off-by: Avinal Kumar <avinal.xlvii@gmail.com>




## References

- Refer https://docs.npmjs.com/cli/v7/using-npm/removal#synopsis

Signed-off-by: Avinal Kumar <avinal.xlvii@gmail.com>

docs/lib/content/using-npm/removal.md

@@ -12,11 +12,7 @@ So sad to see you go.
 sudo npm uninstall npm -g
 ```
 
-Or, if that fails, get the npm source code, and do:
-
-```bash
-sudo make uninstall
-```
+Or, if that fails, please proceed to more severe uninstalling methods.
 
 ### More Severe Uninstalling