migrations: drop documentation.html column

No deployed code refers to this column.

Change-Id: I9bb8ce7c3ea473065ff500c8c7ad9e7ef3ca7053
Reviewed-on: https://go-review.googlesource.com/c/pkgsite/+/274245
Reviewed-by: Julie Qiu <julie@golang.org>
Trust: Jamal Carvalho <jamal@golang.org>
diff --git a/migrations/000052_drop_documentation_html.down.sql b/migrations/000052_drop_documentation_html.down.sql
new file mode 100644
index 0000000..1dbfbea
--- /dev/null
+++ b/migrations/000052_drop_documentation_html.down.sql
@@ -0,0 +1,9 @@
+-- Copyright 2020 The Go Authors. All rights reserved.
+-- Use of this source code is governed by a BSD-style
+-- license that can be found in the LICENSE file.
+
+BEGIN;
+
+ALTER TABLE documentation ADD COLUMN html TEXT NOT NULL;
+
+END;
diff --git a/migrations/000052_drop_documentation_html.up.sql b/migrations/000052_drop_documentation_html.up.sql
new file mode 100644
index 0000000..0b49082
--- /dev/null
+++ b/migrations/000052_drop_documentation_html.up.sql
@@ -0,0 +1,9 @@
+-- Copyright 2020 The Go Authors. All rights reserved.
+-- Use of this source code is governed by a BSD-style
+-- license that can be found in the LICENSE file.
+
+BEGIN;
+
+ALTER TABLE documentation DROP COLUMN html;
+
+END;