fix: Add missing links

README.md

@@ -9,7 +9,7 @@ Developing the site requires [jekyll](https://jekyllrb.com/) and [tailwindcss](h
 ### Jekyll
 
 This website is statically generated using jekyll. Besides jekyll, the two
-jekyll plugins [jekyll-seo-tag](#) and [jekyll-feed](#) must be installed.
+jekyll plugins [jekyll-seo-tag](https://github.com/jekyll/jekyll-seo-tag) and [jekyll-feed](https://github.com/jekyll/jekyll-feed) must be installed.
 
 See [here](https://jekyllrb.com/docs/plugins/installation/) for instructions
 on installing plugins.