e.g. `.. note:`, `.. waning:`, etc.

Remove "hide/show code" button

Two changes:
    -Discarded old iFrameResizer.min.js function (now replaced)
    -Removed "hide/show code" button (now directly in R markdown)

See merge request !2

Resize iframe

In my branch I made the following changes to cepremap:

    -Added iFrameResizer.js to theme/static/js/
    -Modified function call in theme/templates/article.html

See merge request !1

Check tag_cloud plugin is enabled

In version 3.6.0 of Pelican tag_cloud was moved from core to a plugin.
Hence we check the plugin is enabled before displaying the tag cloud.

Add series of images to the sidebar.

Documented use of TAGS_URL setting.