Refactor header Sass into header.scss
Move tagline outside of h1

Keeping it in the header element, but moving it outside of the h1
is better for accessibility.
Fold 'copy' into 'tagline'

It doesn't seem worth it to have two separate fields in Stagecraft
(copy and tagline) that are both styled almost identically.

Add a new 'with-related-pages' class to control the width of the tagline.
Wrap entire realtime module in a paragraph tag

And then use spans to style the impact number.

This involves making the CSS matchers for impact-number and stat-description
more loose, but I don't think that's a problem.
Merge pull request #134 from alphagov/61978710-realtime-module-accessibility

Wrap entire realtime module in a paragraph tag
Merge pull request #133 from alphagov/61978992-improve-page-heading-accessibility

Improve page heading accessibility
Add rightHandGracePixels to hover.js

These few pixels increase the size of the hover area for the middle
section of a graph with linelabels to the right.

Before: as soon as you move from the final date value of the graph
into the linelabel, the hover disappears.

Now: the first few leftmost columns of pixels of the linelabel are
assumed to be hovering on the graph still.
Merge pull request #135 from alphagov/62546586-make-stacked-graph-hovering-easier

Add rightHandGracePixels to hover.js
Use NTA Tabular Numbers everywhere

No really, everywhere.
Merge pull request #136 from alphagov/use-tabular-numbers-EVERYWHERE

Use NTA Tabular Numbers everywhere
Add WAI-ARIA attributes to graph elements

This commit adds role=presentation and aria-hidden=true to all
SVG elements and figcaptions used for linelabels.

This prevents screenreaders from reading out the elements.

As noted in the comment, the WAI-ARIA spec says we may do this
with caution to improve the experience for assistive technologies.
Merge pull request #138 from alphagov/61980510-hide-graphs-from-screenreaders

Add WAI-ARIA attributes to graph elements
Minimum viable GOV.UK dashboard

- Add new stagecraft stub for a GOV.UK dashboard
- Allow the tagline to accept HTML so it can contain links to external
  pages
Add realtime usage module to GOV.UK dashboard
Merge pull request #139 from alphagov/govuk-dashboard

Minmum viable GOV.UK dashboard
Merge branch 'master' into stacked_graph_improvements