Publish build and test reports

[wenkokke]

The build and tests generate reports:

• Shake: already generated, see: Makefile#L35
• HTMLProofer: see HTMLProofer: Reporting
• html-validate
• EPUBCheck: see EPUBCheck: Getting a report in a structured format
• Daisy Ace: see Daisy Ace: HTML Report
• Pandoc: log warnings in runPandoc

These reports should be published as part of the web version of the book.