'last_update' in PDF version not working

[timvink]

When building PDF versions of the website, the last updated date does not display.

Perhaps we can hide it somehow when printing PDF.

[RDIL]

The link attribute has something to do with this, maybe put CSS with display none through that.

[timvink]

When using this plugin with mkdocs-material, the last date is wrapped in a div with class md-source-date. We can prevent displaying the last revision date when printing by adding some extra CSS when building:

@media print {
    .md-source-date { display: none; }
}

Just tested this and it works nicely with mkdocs-pdf-export-plugin

Good to be explicit to users about this, and add an option enable_on_printing with a default of false.

We would also need to wrap output with <span class="git-revision-date-localized"> </span>, so we can also accomodate for use cases without mkdocs-material. CSS to add is then:

@media print {
    .md-source-date { display: none; }
    .git-revision-date-localized { display: none; }
}