Release 0.0.4 - Githubissues

Description

Combine the key documents page with the policy, strategy and national programmes page
Fix issue with Google analytics script not being classed as statistics type
Populate the cookie policy with cookies we use
Populate the accessibility statement with approved content
Use the correct URL for the cookies policy page
Use the approved Hero header image on the homepage
Fix invalid HTML and add cookie declaration to the sitemap
Create a 404 page with some basic content
Improve the README file with a description and contributing
Use the NHSX blue for the homepage hero background colour
Fix the spacing and sizing of typography and components on content pages
Embed videos within content pages, with responsive styling added
Add missing main element to the Homepage for the skip link component
Populate pages with approved content
Add placeholder Homepage sections for video and get involved
Use an improved SVG icon for the NHSX logo
Add hero and promo components with additional NHSX styling to the homepage
Use the correct CSS spelling color for the NHSX colour variables

[x] Tested against the NHS.UK frontend testing policy (Resolution, Browser & Accessibility)
[x] Code follows the NHS.UK frontend coding standards
[x] Documentation
[x] Version number increase (using SEMVER)
[x] CHANGELOG entry
[x] Validated on staging environment (only required for releases)