Remove `< Browse sites` from sidebar #60417

Job	Run time
detect changed files	11s
Changelogger validity	33s
Copied files are in sync	6s
Changelogger use	19s
Project structure	2m 3s
PHP Code Sniffer (non-excluded files only)	1m 52s
PHP Compatibility	1m 10s
PHP lint (7.0)	29s
PHP lint (7.2)	34s
PHP lint (7.4)	42s
PHP lint (8.0)	29s
PHP Code Sniffer (changes to excluded files only)	0s
ESLint (changes to excluded files only)	0s
PHP lint (8.1)	34s
ESLint (non-excluded files only)	0s
PHP lint (8.2)	36s
PHP lint (8.3)	37s
Lock files are up to date	2m 23s
Check linter exclude lists	0s
Lint GitHub Actions yaml files	0s
Monorepo package version refs	1m 4s
	13m 42s

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