Add link to Cmacs

Author: danny-burrows

src/components/portfolio/Portfolio.astro

@@ -109,7 +109,7 @@ import PortfolioItem from './PortfolioItem.jsx'
     <PortfolioItem 
         title="Cmacs" 
         content="Emacs-inspired text editor in C." 
-        link="#"
+        link="https://github.com/danny-burrows/cmacs"
         imgUrl="/assets/portfolio/Cmacs.png"
     client:load/>