[docs] Batch of fixes

[oliviertassinari]

• We have a lot of misses on the spinner search query (73d4370)
• The lab was missing a dependency on warning (fbf75f0)
• Reduce the size of the icons in the demo to reduce the distraction (fb7b768)
• curl -I https://material-ui.com/r/styles-instance-warning returns a 404. It should be fixed (395cf03)
• Work on v3.material-ui.com. Closes Search for v3 docs is broken #16033 ([material-ui] Don't crawl the blog, it's wasteful algolia/docsearch-configs#893) (c939766)
• Merge all the old links into a single one. Closes V3 docs website is down #16248

[mui-pr-bot]

Details of bundle changes.

Comparing: 627da22...64bde33

bundle	parsed diff	gzip diff	prev parsed	current parsed	prev gzip	current gzip
@material-ui/core	0.00%	0.00%	318,911	318,911	87,557	87,557
@material-ui/core/Paper	0.00%	0.00%	68,281	68,281	20,353	20,353
@material-ui/core/Paper.esm	0.00%	0.00%	61,578	61,578	19,133	19,133
@material-ui/core/Popper	0.00%	0.00%	28,968	28,968	10,411	10,411
@material-ui/core/Textarea	0.00%	0.00%	5,513	5,513	2,374	2,374
@material-ui/core/TrapFocus	0.00%	0.00%	3,755	3,755	1,580	1,580
@material-ui/core/styles/createMuiTheme	0.00%	0.00%	16,012	16,012	5,791	5,791
@material-ui/core/useMediaQuery	0.00%	0.00%	2,597	2,597	1,102	1,102
@material-ui/lab	0.00%	0.00%	140,480	140,480	43,417	43,417
@material-ui/styles	0.00%	0.00%	51,703	51,703	15,337	15,337
@material-ui/system	0.00%	0.00%	15,266	15,266	4,333	4,333
Button	0.00%	0.00%	84,273	84,273	25,630	25,630
Modal	0.00%	0.00%	20,345	20,345	6,689	6,689
Slider	0.00%	0.00%	74,587	74,587	23,184	23,184
colorManipulator	0.00%	0.00%	3,904	3,904	1,544	1,544
docs.landing	0.00%	0.00%	55,232	55,232	13,946	13,946
docs.main	+0.01% 🔺	+0.01% 🔺	650,961	651,017	205,016	205,042
packages/material-ui/build/umd/material-ui.production.min.js	0.00%	0.00%	292,168	292,168	83,484	83,484

Generated by 🚫 dangerJS against 64bde33

Updated. I also had to change the status code from 307 to 302 to make it work. e.g: https://material-ui.com/r/caveat-with-refs-guide KO

[SerdarSanri]

@oliviertassinari I noticed you removed all 3.x version documentation under v3 in documentation. and I assume it is 3.9.2 which was the last 3.x version. Is this means all releases prior to 3.9.2 are no longer supported? In many companies like ours, upgrading a package major like material-ui is not that quick and easy thing to do. we were at 3.8. Now I see that entire documentation is gone that it will be really difficult for us to find out components supported in that version and their props etc without diving in material-ui source. wouldn't that be better to keep those in a separate place like an archive and announce when they will be removed so people who are using it will be aware at x date it will no longer be supported.

[oliviertassinari]

@SerdarSanri is your team able to use https://v3.material-ui.com/? This documents v3.9.3.

[SerdarSanri]

@oliviertassinari We haven't upgraded to 3.9.2 yet. At least it is in our pipeline. I should have download documentation for 3.8. But because I don't have a reference what is different in between 3.8 and 3.9 it may cause issues. We may use components/props doesn't exist yet at 3.8 but introduced after.

[oliviertassinari]

I can imagine, we don't document the version the new APIs have been introduced. I have removed the subdomains of older documentation versions as the builtin search was broken, making it hard to use. The new strategy should prevent this problem with the v4.x versions when we release v5.

We may use components/props doesn't exist yet at 3.8 but introduced after.

If that's the case, you will need to upgrade to use it right? The upgrade between v3.8 and v3.9.3 should be straightforward. I would encourage this approach. Let's wait and see if we get more request for this.

[SerdarSanri]

would that be possible to at least provide compressed documentation to download. So we can download and deploy locally.

[oliviertassinari]

@SerdarSanri Sure, you can clone the repository, checkout the version, run yarn, run yarn docs:dev.