[Site rewrite] Migrate site to astro (#606)

[gregwhitworth]

• initial astro commit

• minor config change

• move over sources

• fix prettier formatting

• rename files and create layout

• move to markdown

• migrate markdown file

• get navigation working

• fix routing for pages

• update the documentation

• more fixes to styling

• get layouts working for all pages

• improve styles even more

• get build working

• fix image

• fix navigation order

• get navigation working

• add favicon

• fix page title

• fix menu sorting

• fix lighthouse issues

• update node version

• minors to styles

• override gatsby build config

• typo

• fix navigation styles

• remove unused dependencies, remove render blocking resources, prefetch resources

• reduce font flashing, fix markup issues

• fix build from breaking

• test removing prefetch

• rmeove compression

• revert changes to config

• fix prefetch

• fix image paths

• Create 2022-12-01.md

• Update 2022-12-01.md

• Update 2022-12-01.md

• Update popup.research.explainer.mdx (Remove lingering mention of popover=hint in the explainer #644)

Remove lingering mention of popover=hint for now.

• Popover target attribute updates (Popover target attribute updates #647)

The popovertoggletarget, popovershowtarget and popoverhidetarget attributes will initially map to aria-expanded.

This has already been implemented in Chromium browsers. HTML AAM PR to add this mapping to the spec: w3c/html-aam#446

• Create 2023-01-05.md

• Update 2023-01-05.md

• Create 2023-01-12.md

• docs: add kolibri accessible component lib (docs: add kolibri accessible component lib #624)

• Update 2023-01-12.md

• Create 2023-01-19.md

• Task: Add redirect for popup (Task: Add redirect for popup #653)

• add redirect for popup

• refactor code

• let yarn do its thing

• revert formatting change

• add redirect comment

• Update popover.research.explainer.mdx (Update popover.research.explainer.mdx #654)

• Update popover.research.explainer.mdx

• Update research/src/pages/popup/popover.research.explainer.mdx

• Create 2023-02-02.md

• fix layout issue

• fix interactions

• Update 2023-02-02.md

• Update 2023-02-02.md

• selectmenu is an element, code escape it (selectmenu is an element, code escape it #660)

• update layout and remove stale content

• handle missing images

• minor fixes and redirects

• fix dead links

• Create 2023-02-16.md

• Update 2023-02-16.md

• Adjusted the home page to reflect the current reality and ensure the relationship between Open UI & the W3C is clear (Adjusted home page content #663)

• Create 2023-02-23.md

• minor improvements

• temporarily prevent refetch

• revert prefetch change

• Update 2023-02-23.md

• performance + a11y improvements

• remove Lora font family

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