Remove barback from the repo.

pkg/barback/example/aggregate_transformer/lib/recipes-grammas/winter-squash-pie-recipe.html

Index: pkg/barback/example/aggregate_transformer/lib/recipes-grammas/winter-squash-pie-recipe.html
diff --git a/pkg/barback/example/aggregate_transformer/lib/recipes-grammas/winter-squash-pie-recipe.html b/pkg/barback/example/aggregate_transformer/lib/recipes-grammas/winter-squash-pie-recipe.html
deleted file mode 100644
index 3445186df1e9ed2eea85bea9490c671ab0ef99fc..0000000000000000000000000000000000000000
--- a/pkg/barback/example/aggregate_transformer/lib/recipes-grammas/winter-squash-pie-recipe.html
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-
-<h2><a name="winter-squash-pie">Winter Squash Pie</a></h2>
-<ul>
-<li>2 eggs</li>
-<li>3/4 cup brown sugar</li>
-<li>1 tsp cinnamon</li>
-<li>1/4 tsp ginger</li>
-<li>1/4 tsp cardamom</li>
-<li>1 cup evaporated milk</li>
-<li>1/2 cup cream</li>
-<li>1-1/2 cups winter squash (such as pumpkin), pureed</li>
-<li>1 9" (single) pie crust</li>
-</ul>
-<p>
-Mix eggs and sugar together. Add pumpkin and mix. Add salt and spices.
-Slowly stir in evaporated milk, and then the cream.</p>
-<p>
-Pour into un nbaked pie crust. Bake in a preheated 425&deg;F oven
-for 15 minutes. Turn heat down to 325&degF and bake another 45 minutes
-until center is firm.</p>
-<p>
-Remove from oven and cool on a rack before serving.</p>
-<p>
-Serve with whipped cream.</p>