update: Pro Plan update

[jemgillam]

An update to reflect the new Pro plan page at postgraphile.org (https://github.com/graphile/crystal/pull/1964)

• Add new columns for sponsorship
• Add new rows with sponsorship benefits
• Condense the table with tooltips
• New description at the top, as discussed previously
• Updated FAQ below to incorporate sponsorship
• Tweaks to the styling
• Implements a new SPON badge

~EDIT Argh I've just realised something is still missing, hold off a moment~

Made sure it works in the mobile view

New Sponsor badge added to the docs, it links to /sponsor/