feat: implement overlay main screen redesign

[Princesseuh]

Changes

Implements a redesign of the main screen, now showing the coolest integrations, more links to click on, more neat info (there's a button to copy astro info directly, it's cool!)

Testing

Will be tested in details separately, much like other overlay PRs, however the current tests should already make sure that the window does work.

Docs

WIP

[changeset-bot]

🦋 Changeset detected

Latest commit: 21713dc

The changes in this PR will be included in the next version bump.

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[github-actions]

⚖️ Bundle Size Check

Latest commit: fdbdda2

File	Old Size	New Size	Change
dev-overlay/entrypoint	52.81 KB	85.3 KB	+ 32.49 KB
dev-overlay/overlay	25.88 KB	40.11 KB	+ 14.23 KB
dev-overlay/plugins/astro	2.26 KB	46.41 KB	+ 44.14 KB
dev-overlay/plugins/settings	2.74 KB	3.07 KB	+ 335 B
dev-overlay/plugins/utils/icons	0 B	698 B	+ 698 B
dev-overlay/plugins/utils/window	932 B	851 B	- NaN undefined
dev-overlay/ui-library/badge	0 B	1.62 KB	+ 1.62 KB
dev-overlay/ui-library/button	0 B	1.72 KB	+ 1.72 KB
dev-overlay/ui-library/card	16.8 KB	1.63 KB	- NaN undefined
dev-overlay/ui-library/highlight	16.48 KB	30.73 KB	+ 14.25 KB
dev-overlay/ui-library/icon	0 B	29.96 KB	+ 29.96 KB
dev-overlay/ui-library/icons	15.05 KB	29.28 KB	+ 14.23 KB
dev-overlay/ui-library/index	0 B	41.58 KB	+ 41.58 KB
dev-overlay/ui-library/window	17.64 KB	1.81 KB	- NaN undefined

[natemoo-re]

Added icon fallbacks when the integration doesn't have an image