Add Nginx section to the Network Servers chapter in addition to Apache.

[murray]

Summary

Update the Apache section of the Network Servers chapter to be an HTTP
section and include a new sub-section for Nginx, in addition to the
existing material for Apache.

Test Plan

Review output at https://people.freebsd.org/~murray/handbook/network-http.html

[murray]

Adding the makefile change to add a symlink from the old html file name.

[bcr]

I love having an nginx section in the handbook, thanks for that initial writeup.
I've only a minor style issue to report. Maybe textproc/igor will find something...

en_US.ISO8859-1/books/handbook/network-servers/chapter.xml

3458

When a new section starts, there should be an empty line above. See:
https://www.freebsd.org/doc/en_US.ISO8859-1/books/fdp-primer/docbook-markup-document-structure.html

3741

There should be an empty line above an opening <sectX>.

3828

Another empty line above here.

[bcr]

ping?

[bcr]

Where are we on this? I think we're ready to commit this. Would be a shame to let this rot here in Phabricator...

[bcr]

Any updates?

[bcr]

Overcome by events (DocBook XML migration, mentee timeout).