add rakefile for convenient builds

Rakefile

@@ -0,0 +1,28 @@
+# task default: %w[build]
+
+task :default do
+  system "rake --tasks"
+end
+
+namespace :pipenv do
+  desc "Build docs using pipenv"
+  task :build do
+    exec 'WORKDIR=/doc PIPENV_VENV_IN_PROJECT=1 pipenv run make html'
+  end
+
+  desc "Install pipenv dependencies"
+  task :install do
+    exec 'WORKDIR=/doc PIPENV_VENV_IN_PROJECT=1 pipenv install'
+  end
+end
+
+namespace :docker do
+
+  desc "Build docs using docker"
+  task :build do
+    exec 'docker run --rm -i -t -v "${PWD}:/doc" -u "$(id -u):$(id -g)" ohiosupercomputer/docker-sphinx make html'
+  end
+end
+
+desc "Build docs using pipenv (shortcut)"
+task :build => ["pipenv:build"]