enhanced INSTALL.md (cf. #4)

6 jobs for remove_obsolete_files_from_latex-template_path in 3 minutes and 40 seconds (queued for 2 seconds)
Status Name Job ID Coverage
  Test
passed unittests_debian_10 #463617

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passed unittests_debian_latest #463618

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passed unittests_ubuntu_1804 #463619

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passed unittests_ubuntu_2004 #463620

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  Deploy
passed pages #463621

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passed pages:deploy

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