changes to the sidebar, cards and footer (#237)

* added responsiveness to sidebar and sticky footer

* remobed unused vars

* added functionality to read more button

* a minor logical error fixed

* removed footer

app/src/components/layout.js

@@ -29,12 +29,8 @@ const Layout = ({ children }) => {
       <Header siteTitle={data.site.siteMetadata.title} />
       <div className="container mx-auto px-10">
         <main>{children}</main>
-        <footer>
-          © {new Date().getFullYear()}, Built with
-          {` `}
-          <a href="https://www.gatsbyjs.org">Gatsby</a>
-        </footer>
       </div>
+      
     </>
   )
 }