Added Refresh Link and pagination in Sketch-sh

A note writing application for teaching and sharing ReasonML code with inline evaluation.

This project help me learning some of the cool features of reasonml. As a part of my contribution I completed following tasks:-

- Added the refresh link i.e if the import module is updated then it will also be updated to latest version in the used module.
- Added pagination while getting user's saved sketches
- Reset the apollo cache after logout
- Added the ctrl+shift+enter shortcut for saving the sketch
- Validate Cache after getting new sketch

You can check out my contribution here

Project link: https://github.com/Sketch-sh/sketch-sh