Improve EPUB accessibility
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Running Daisy ACE on a generated EPUB gives 5 "serious", 7 "moderate", and 1 "minor" accessiblity issues.
The "minor" issue is a missing ARIA role to match the epub:type (which is toc) on the nav element in nav.xhtml.
One of the "moderate" issues is that the schema:accessModeSufficient metadata is not present in content.opf; the remaining "moderate" issues seem to all be that heading levels increase by more than one at a time.
The first "serious" issue is a missing xml:lang attribute in content.opf; the remainder are missing Schema.org metadata (schema:accessMode, schema: accessibilityFeature, schema: accessibilityHazard, and schema: accessibilitySummary) in content.opf.
In addition, image alt text is almost certainly useless to screen-reader users ...