[gutvol-d] Viewport meta tags

For volunteers that are contributing new books: There is a tag that is now recommended to be in the header of new HTML submissions, as documented here: https://www.pgdp.net/wiki/DP_Official_Documentation:PP_and_PPV/Post-processi... <meta name="viewport" content="width=device-width, initial-scale=1"> This had been dropped from previous templates and documents but is now recommended for HTML files. An example is available here: https://www.gutenberg.org/cache/epub/77200/pg77200-images.html The HTML file is much easier to read on smaller devices due to the inclusion of this tag. Please let me know if you have any questions. …Ross…