TAM CI/CD update to CI/CD Quickstart page

What does this MR do?

This MR adds two new sections and some additional links to other Docs page. This information is from the TAM CI/CD enablement series that new customers receive when they start with us. It includes best practices, examples, and suggestions as well as some additional explanation of the jobs and stages.

For reviewers/approvers:

• I am not positive about the order of these, and hope you can verify if the headings I added are in the right place.
• This information comes from the TAM team, and includes best practices and links to other Docs pages. It is accurate as far as I know, and agnostic of version, at least broadly.
• I have not removed anything from the page, or edited any of it, except to add text and headings.

Does this MR meet the acceptance criteria?

Conformity

• I have self-reviewed this MR per code review guidelines.
• This MR does not harm performance, or I have asked a reviewer to help assess the performance impact. (Merge request performance guidelines)
• I have followed the style guides.
• This change is backwards compatible across updates, or this does not apply.

Availability and Testing

Only text has been added, no screenshots or other information. Two headings (H3) have been added, while the rest of the additions are included in existing headings.

This has passed basic linting through VS Code.

• I have tested this MR in all supported browsers, or it's not needed.