* fix: Use single quotes instead of backticks when specifying the environment variable that should be substituted for the envsubst command. GitHub issue: #3079 Removed duplicate calls to envsubst. Default nginx listen port is now 80. Adde markdown documentation. * fix: Fixed some typos and wording in markdown documentation. GitHub issue: #3079 Co-authored-by: Joe Boccanfuso <joe.boccanfuso@radicalimaging.com>