Absorb tech leads content from technology wiki

[MatMoore]

There is a tech community wiki here https://sites.google.com/a/digital.cabinet-office.gov.uk/gds-technology/roles/tech-lead

It's quite out of date and may go away. But it has some interesting content around the role of the tech lead.

This issue is to consider whether we want to absorb this into the learning pathways, and if so how best to do it.

• [ ] Ask some tech leads whether this still reflects reality (it's from 2014)
• [ ] Decide which parts are useful to prospective or current tech leads
• [ ] Work out where it fits into the project