Fix accessibility issues by updating the govuk_tech_docs gem to 2.2.0

[kr8n3r]

What

First, update the govuk_tech_docs gem from 2.1.0 to 2.2.0.

Change log

2.2.0

Accessibility Fixes

• #205: Improve table of contents accessibility
• #209: Some search and keyboard navigation updates
• #210: Stop linking images to new tabs
• #214: Implement row level table headings to allow accessible tables with row headings
• #215: Add tabindex and focus states to code blocks

Docs

• #206: Remove tdt docs content from readme file

2.1.1

Fixes

We’ve made fixes in the following pull requests:

• #199: Fix page expiry box link colours (hover and focus)

Ruby version bump

We've updated the Ruby version supported:

• #201: Bump ruby to 2.7.2

This PR

• updates the dependencies
• adds row headers to tables

Example of table row header change

Before

After

Why

Version 2.2.0 of the tech docs gem is now live and incorporates fixes to a number of accessibility issues in the technical documentation template which are referenced in our accessibility statement:

• Some tables in content do not have column row headers when needed.
• Users cannot tab to code examples to scroll them using the keyboard.
• The search field and the ‘Hide table of contents’ button are not placed logically in the focus order.
• Users can focus elements that are hidden visually behind other content, for example when using the search field.
• Images link to a new tab without telling users, and do not have link text.

How to review

• check for any tables that have missing row header
• cookie banner buttons stil look good

Who can review

not @kr8n3r