Add some Curriculum Resources

[tobyhodges]

Related to #155 and #148

Adds a bunch of handbook pages.

Updating and migrating existing content from the Lesson Development section of the current handbook:

• Lesson Release Process

Updating and migrating existing content from the Curriculum Development Handbook:

• Lesson Development Roles
• Lesson Sprint Recommendations
• Lesson Life Cycle

A couple of brand new pages:

• Forking a lesson repo
• Describing curriculum/workshop overview sites

FYI @ErinBecker

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[maneesha]

Thanks Toby!
I have reorganized some files to keep things neat. A few other notes before we can merge:

• In a few places you refer to the non-existent files lesson_pilots.md and curriculum-structure.md
• You have an empty link on this line

[maneesha]

@tobyhodges I see now that the Curriculum Structure resource is addressed in #155.
I am still not sure about the Lesson Pilot resource.

I will work on bringing the content from the google docs you shared in #155 into this PR so we can review everything together.

[tobyhodges]

Thanks @maneesha. Regarding the Lesson Pilots page, in #148 I mention

Lesson Pilot Workshops info should be moved to its own page, and linked from

• the Resources section of the Lesson Developer Handbook
• the Curriculum Resources page

It is this new page, created from the existing content in the Lesson Development materials, that would be linked here.

[tobyhodges]

You have an empty link on this line

Great catch, thanks! Fixed now.