docs: offer to make a custom theme

[hanspagel]

I thought it would be fun to offer our help with custom themes.

We do this anyway, why not promote it? :)

Also, I love to show the Windows 98 example to people. This PR adds a link to it in the styling section.

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Latest commit: 59d81ef

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[relativeci]

#1237 Bundle Size — 1.9MiB (0%).

59d81ef(current) vs d4d2d75 main#1217(baseline)

Warning

Bundle contains 4 duplicate packages – View duplicate packages

Bundle metrics  no changes

	Current #1237	Baseline #1217
Initial JS	1.9MiB	1.9MiB
Initial CSS	0B	0B
Cache Invalidation	0%	0%
Chunks	1	1
Assets	1	1
Modules	1045	1045
Duplicate Modules	0	0
Duplicate Code	0%	0%
Packages	158	158
Duplicate Packages	4	4

Bundle size by type  no changes

	Current #1237	Baseline #1217
JS	1.9MiB	1.9MiB

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Bundle analysis report Branch docs/custom-themes Project dashboard

[marclave]

love this @hanspagel we should drop my calendar link too

https://cal.com/scalar

i'll add a theme option :)