Update tutorials_getting_started.md

[emiliom]

• Update OHW nbgitpuller links
• Update OHW23 schedule link
• Fix broken link to extended discussion about nbgitpuller, git, etc

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[emiliom]

The link in the last section is not being created! It's a link to a page section, and either I'm getting the syntax wrong or we need to enable a sphinx plugin to generate section header anchors automatically.

[emiliom]

Alright, fixed!