Update introduction.md

[ajthiesen]

Rewrite the Introduction of the Labs to be engaging and informative; as well as laying the groundwork for upcoming Lab documentation and tutorials.

Author checklist (Completed by original Author)

• Good fit for the Rocky Linux project? Title and Author Metatags inserted ?
• If applicable, steps and instructions have been tested to work
• Initial self-review to fix basic typos and grammar completed

Rocky Documentation checklist (Completed by Rocky team)

• 1st Pass (Document is good fit for project and author checklist completed)
• 2nd Pass (Technical Review - check for technical correctness)
• 3rd Pass (Detailed Editorial Review and Peer Review)
• Final approval (Final Review)

[github-actions]

Test results for 9884616:

Number of broken URLs: 6

URL,RESULT,FILENAME
 https://azure.microsoft.com,failed,guides/automation/templates-automation-packer-vsphere.md
 http://www.modsecurity.org/,failed,guides/web/apache_hardened_webserver/modsecurity.md
 https://ersei.saggis.com/,failed,guides/contribute/README.md
 http://www.flaviosiqueira.com.br/,failed,guides/contribute/README.md
 https://github.com/andrewthiesen,failed,guides/contribute/README.md
 https://github.com/bdacus01,failed,guides/contribute/README.md