docs: fix website broken links

[alexandear]

This PR fixes broken links on the https://golangci-lint.run/ found by the linkchecker.

linkchecker output

❯ linkchecker --no-warnings https://golangci-lint.run/
INFO linkcheck.cmdline 2024-03-15 21:14:06,351 MainThread Checking intern URLs only; use --check-extern to check extern URLs.
LinkChecker 10.4.0
Copyright (C) 2000-2016 Bastian Kleineidam, 2010-2023 LinkChecker Authors
LinkChecker comes with ABSOLUTELY NO WARRANTY!
This is free software, and you are welcome to redistribute it under
certain conditions. Look at the file `COPYING' within this distribution.
Read the documentation at https://linkchecker.github.io/linkchecker/
Write comments and bugs to https://github.com/linkchecker/linkchecker/issues

Start checking at 2024-03-15 21:14:06+003
 2 threads active,     0 links queued,    0 links in   2 URLs checked, runtime 1 seconds
10 threads active,    24 links queued,   36 links in  70 URLs checked, runtime 6 seconds
10 threads active,    15 links queued,  396 links in 421 URLs checked, runtime 11 seconds

URL        `/usage/performance'
Name       `Very fast'
Parent URL https://golangci-lint.run/, line 154, col 2101
Real URL   https://golangci-lint.run/usage/performance
Check time 3.668 seconds
Size       8KB
Result     Error: 404 Not Found

URL        `/usage/integrations'
Name       `Integrations'
Parent URL https://golangci-lint.run/, line 154, col 2304
Real URL   https://golangci-lint.run/usage/integrations
Check time 3.275 seconds
Size       8KB
Result     Error: 404 Not Found
10 threads active,     7 links queued,  446 links in 463 URLs checked, runtime 16 seconds

URL        `/usage/install'
Name       `Get started now!'
Parent URL https://golangci-lint.run/, line 154, col 2754
Real URL   https://golangci-lint.run/usage/install
Check time 3.587 seconds
Size       8KB
Result     Error: 404 Not Found

URL        `/usage/quick-start'
Name       `Quick Start: how to use golangci-lint'
Parent URL https://golangci-lint.run/welcome/install/, line 169, col 3303
Real URL   https://golangci-lint.run/usage/quick-start
Check time 2.998 seconds
Size       8KB
Result     Error: 404 Not Found

URL        `/usage/install/#versioning-policy'
Name       `our versioning policy'
Parent URL https://golangci-lint.run/contributing/workflow/, line 150, col 1896
Real URL   https://golangci-lint.run/usage/install/#versioning-policy
Check time 3.370 seconds
Size       8KB
Result     Error: 404 Not Found
 1 thread active,     0 links queued,  462 links in 464 URLs checked, runtime 21 seconds

Statistics:
Downloaded: 3.19MB.
Content types: 11 image, 33 text, 0 video, 0 audio, 10 application, 0 mail and 409 other.
URL lengths: min=14, max=508, avg=45.

That's it. 463 links in 464 URLs checked. 0 warnings found (6 ignored or duplicates not printed). 5 errors found.
Stopped checking at 2024-03-15 21:14:28+003 (22 seconds)

[ldez]

LGTM