Improve the CSS of our tables

We’re using table in our documentation in very important places to display complex information.

Their style is pretty poor, they are unappealing and hard to read:

• https://tails.boum.org/install/inc/steps/not_at_all.inline/
• https://tails.boum.org/doc/first_steps/accessibility/#index2h1
• https://tails.boum.org/doc/first_steps/startup_options/
• https://tails.boum.org/support/known_issues/graphics/#index1h2
• https://tails.boum.org/doc/encryption_and_privacy/veracrypt/#index1h2 (not merged yet)

Let’s make them fancier and easier to read!

/!\ ikiwiki uses table to display images with caption. See /news/version_2.0.mdwn for example.

Feature Branch: web/15688-better-tables

Related issues

• Blocks #15392 (closed)

Original created by @sajolida on 15688 (Redmine)