Version 2.1

Minor update to:

• ADD an example HTML output file, integrated with GitHub Pages
• ADD a version checker for DESeq2: there is a warning if the version is smaller than 1.48.0
• CHANGE the GenomiqueENS logo to the Eoulsan logo
• CHANGE a bit the CSS behind the HTML output file
• CHANGE the authorMail parameter name to authorEmail
• FIX the value of the authorEmail parameter
• FIX the volcano plot when there are null adjusted p-values