Further resources should be divided by level

[lilliealbert]

Thinking about turning each of the topics on the learning resources page into a table including the following columns:

• title
• type (book, tutorial, screencast, online course, reference, etc.)
• blurb
• level (beginner, intermediate, advanced, perhaps?)
• cost
• link to the resource

And that the table should be sorted by level by default. We could use data-tables to make the table sortable by any column.

One concern: how terrible this will look on mobile :frowning:

[lilliealbert]

We should use DataTables to make the learning resources sortable.

Use icons for type of resource in learning resources