Add OpenAPI HTTP spec (#1804)

api/docs/generate-docs.sh

@@ -0,0 +1,23 @@
+#!/usr/bin/env sh
+
+# Requirements:
+# - Node.js
+# - redoc-cli (`npm install redoc-cli -g`)
+
+redoc-cli bundle ../mailinabox.yml \
+  -t template.hbs \
+  -o api-docs.html \
+  --templateOptions.metaDescription="Mail-in-a-Box HTTP API" \
+  --title="Mail-in-a-Box HTTP API" \
+  --options.expandSingleSchemaField \
+  --options.hideSingleRequestSampleTab \
+  --options.jsonSampleExpandLevel=10 \
+  --options.hideDownloadButton \
+  --options.theme.logo.maxHeight=180px \
+  --options.theme.logo.maxWidth=180px \
+  --options.theme.colors.primary.main="#C52" \
+  --options.theme.typography.fontSize=16px \
+  --options.theme.typography.fontFamily="Raleway, sans-serif" \
+  --options.theme.typography.headings.fontFamily="Ubuntu, Arial, sans-serif" \
+  --options.theme.typography.code.fontSize=15px \
+  --options.theme.typography.code.fontFamily='"Source Code Pro", monospace'