Document FormHandler table issues

• link: false or link: function () { return false } in a column should disable the link
• link: "?col=value" supports custom filtering. For example, click on name column to filter by ?dir=<%- row.path %>
• How can we add classes to specific column headers? (e.g. text-right only on numeric classes)
• How can we open links in a new window? Can we add a link class?
• How can we use FormHandler table with a JSON dataset (not a FormHandler URL)?
• How can we create a grid instead of a table?
• How can we customize just the grid cells?
• How can we customize just a few columns?
• How can we create editable tables with dropdown values, and customize their appearance?
• How can we create editable tables with checkboxes or radio buttons?
• How can we add custom actions?
• Show examples of theming (see https://www.smashingmagazine.com/2019/02/complex-web-tables/)