Update Project Page

reduce the size of the logo a bit so that second chart is not too much out of view. It cannot be gauranteed that it will be in view in lesser resolutions though. In this comit it is on the same position as it was earlier

Added logo and changed font to rubik

refactor(charts.js): use switch instead of multiple if else

Add Markdown syntax highlight to html code snippet

Create PULL_REQUEST_TEMPLATE.md