Add Jekyll configuration

.gitignore

@@ -1,2 +1,4 @@
-*.cabal
+Gemfile.lock
+_site/
+
 .stack-work/

Gemfile

@@ -0,0 +1,3 @@
+source "https://rubygems.org/"
+
+gem "github-pages"

_config.yml

@@ -0,0 +1,18 @@
+exclude:
+  - CHANGELOG.md
+  - Gemfile
+  - Gemfile.lock
+  - LICENSE.md
+  - Main.hs
+  - licensor.cabal
+  - package.yaml
+  - src/
+  - package.yaml
+  - stack.yaml
+  - stack.yaml.lock
+
+plugins:
+  - jekyll-readme-index
+
+readme_index:
+  remove_originals: true