Add content of the draft of our browser support strategy to our docs

[romaricpascal]

WIP The README still needs updating following this discussion on Slack (internal link) to link to the docs

Adds the content of the draft of the full version of our browser support strategy to the docs (internal link).

The location is based on this discussion on Slack (internal link).

I've brought the range of Safari versions from the summary.

The table has to be in HTML due to some complex content in the cells. I've opted for semantics when marking up the list of browsers in there, which adds bullets at the start of the list items. If we prefer the formatting from the document, we can go with paragraphs and <br>:

<p>
Chrome 61+<br>
Edge 16-18<br>
Edge 79+<br>
Safari 11+ (mac)<br>
Firefox 60+<br>
Opera 48+
</p>
<p>
Safari 10.3+ (iOS)<br>
Samsung Internet 8.2+
</p>

Part of alphagov/govuk-frontend-docs#340 (the issue needs to wait for the guidance summary to have been merged on the govuk-frontend-docs repo before being closed).

[github-actions]

📋 Stats

File sizes

File	Size
dist/govuk-frontend-5.0.0-internal.0.min.css	114.01 KiB
dist/govuk-frontend-5.0.0-internal.0.min.js	37.86 KiB
packages/govuk-frontend/dist/govuk/all.bundle.js	76.77 KiB
packages/govuk-frontend/dist/govuk/all.bundle.mjs	72.08 KiB
packages/govuk-frontend/dist/govuk/all.mjs	3.8 KiB
packages/govuk-frontend/dist/govuk/govuk-frontend-component.mjs	359 B
packages/govuk-frontend/dist/govuk/govuk-frontend.min.css	113.99 KiB
packages/govuk-frontend/dist/govuk/govuk-frontend.min.js	37.84 KiB
packages/govuk-frontend/dist/govuk/i18n.mjs	5.3 KiB

Modules

File	Size
all.mjs	68.41 KiB
components/accordion/accordion.mjs	21.05 KiB
components/button/button.mjs	4.18 KiB
components/character-count/character-count.mjs	20.49 KiB
components/checkboxes/checkboxes.mjs	5.31 KiB
components/error-summary/error-summary.mjs	5.49 KiB
components/exit-this-page/exit-this-page.mjs	15.49 KiB
components/header/header.mjs	3.39 KiB
components/notification-banner/notification-banner.mjs	4.02 KiB
components/radios/radios.mjs	4.31 KiB
components/skip-link/skip-link.mjs	3.3 KiB
components/tabs/tabs.mjs	9.07 KiB

View stats and visualisations on the review app

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Action run for 1f8047a

[claireashworth]

Suggested change

	Users can access government services through a wide range of new to older browsers. Our components provide a baseline experience through HTML and CSS, allowing all users to complete their tasks even [if JavaScript is not working](https://www.kryogenix.org/code/browser/everyonehasjs.html). Some components have JavaScript enhancements which add extra features or fix accessibility issues.
	Users can access government services through a wide range of new to older browsers. Our components provide a baseline experience through HTML and CSS, allowing all users to complete their tasks even if JavaScript is not working. Some components have JavaScript enhancements which add extra features or fix accessibility issues.

[colinrotherham]

The table looks great on wider screens, but it's super squished on mobiles 😣

Think we can find an alternative?

[colinrotherham]

We disable Prettier embeddedLanguageFormatting but probably stick to 2-spaces?

Suggested change

<table>

<tbody>

<table>

<tbody>

[claireashworth]

I can move everything out into bullet points for each grade?

[domoscargin]

Suggest we leave the table in for this pre-release, then think about another solution for the next, or as @romaricpascal has pointed out - before any user sessions.

[domoscargin]

Looks good!