Include substitution of year in user-defined copyright strings

Samuel W. Flint

25.42.2021 bfc7ed81a53c21104c2862f8db79841e3b77b5ff

Include substitution of year in user-defined copyright strings

Document as well

 README.md

@@ -87,9 +87,9 @@
Add your own favicon in `static/favicons/favicon.ico`.

### Copyright
By default, the copyright will show the authors name followed by the current year, but you can change this by configuring the `copyright` parameter.
By default, the copyright will show the authors name followed by the current year, but you can change this by configuring the `copyright` parameter.  If this method is used, the string `{{ YEAR }}` will be replaced with the current year during site generation.
```toml
copyright = "2020-2021"
copyright = "2020-{{ YEAR }}"
```

### Navigation items

 layouts/partials/sidebar.html

@@ -18,6 +18,6 @@
        {{ end }}
    </ul>
    <div class="footer">
        <div class="by_farbox">&copy; {{ if isset .Site.Params "copyright" }} {{ .Site.Params.copyright | markdownify }} {{ else }} {{ .Site.Params.author }} {{ now.Format "2006"}} {{end}}</div>
        <div class="by_farbox">&copy; {{ if isset .Site.Params "copyright" }} {{ replace .Site.Params.copyright "{{ YEAR }}" (now.Format "2006") | markdownify }} {{ else }} {{ .Site.Params.author }} {{ now.Format "2006"}} {{end}}</div>
    </div>
</div>