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several error logs 

{{ updated }}
System Status: Error

    Cron Not Running
    Incorrect Resource URL
    Configure Default Mailbox
    Complete Setup
    Old files

UPDATE #2

Thanks again, KarinG. That project does not seem to be working for me at the moment. Any guidance?

~/sandbox $ composer create-project drupal/recommended-project my_client_crm
Creating a "drupal/recommended-project" project at "./my_client_crm"
The "https://repo.packagist.org/packages.json" file could not be downloaded: failed to open stream: Connection timed out
https://repo.packagist.org could not be fully loaded, package information was loaded from the local cache and may be out of date

Applying the changes recommended by KarinG below, and then browsing to /civicrm, in the logs I am now seeing all these 404's:

Applying the changes recommended by KarinG below, led me to these errors:

several error logs 

which led me to run this change:

/usr/bin/find files/ -type d -exec /bin/chown www-data: {} \

and then browsing to /civicrm, in the logs I am now seeing all these 404's: