Updated Zope documentation sources for Zope 5

[dataflake]

Fixes #659

Rearrange and update the general documentation (not the books, those are tracked in #252 and #671 already)

• make "What's New" into a toplevel page with subsections for major versions
• create a toplevel section for migrations with subsections for major versions
• fold the WSGI page into the configuration documentation
• update old version numbers where needed
• rename addzope2user console script to addzopeuser

[jugmac00]

Thank you for taking your time for this!

I like the changes.

There was one minor thing which confused me at first.

When you click on "Migrating between Zope versions", the tree with sub bullet points is fully expanded (all levels are expanded).

But when you click on "Migrating from Zope 2 to Zope 4 or 5" the tree gets partially collapsed.

I'd suggest that the tree stays expanded (Or even swap the behavior and on the top level show only the top sub-levels, and expand more when you drill deeper).

I am not sure if I could express clearly.

Example
on top level you see this

a
  b1
    c1
       d1
       d2
    c2
  b2
  b3

When you drill deeper, you see less details.

b1
  c1
  c2
b2
b3

Usually, this is vice versa.

[dataflake]

You're right, I noticed menu trees that did not explicityly specify the maximum depth. It's changed to be consistent now.