feat: add logo and favicons (#24) #8

Job	Run time
Coverage report / test-coverage-internal	1m 56s
Check NN version / macos-latest (R 4.3.1, 2023-10-25)	1m 31s
Check current version / macos-latest (release)	1m 29s
Check NN version / macos-latest (R 4.4.1, 2024-08-06)	1m 49s
Check current version / windows-latest (release)	2m 42s
Check NN version / windows-latest (R 4.3.1, 2023-10-25)	5m 50s
Check current version / ubuntu-latest (devel)	2m 6s
Check NN version / windows-latest (R 4.4.1, 2024-08-06)	2m 2s
Check current version / ubuntu-latest (release)	2m 12s
Check NN version / ubuntu-latest (R 4.3.1, 2023-10-25)	5m 57s
Check current version / ubuntu-latest (oldrel-1)	1m 23s
Check NN version / ubuntu-latest (R 4.4.1, 2024-08-06)	5m 16s
Megalinter / MegaLinter	2m 25s
Pkgdown site / pkgdown	2m 22s
	39m 0s

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