Cleanup the install script#341

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BrentBaccala wants to merge 6 commits intobigbluebutton:masterfrom

BrentBaccala:cleanup

Commits on Jan 11, 2023

duplicate last four commits to bbb-install.sh into bbb-install-2.5.sh and bbb-install-2.6.sh
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Commits on Jan 18, 2023

remove APT_KEY_DONT_WARN_ON_DANGEROUS_USAGE=true, since we want
BrentBaccala
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