Migrate doc to Hugo/AsciiDoctor

I'm very pleased to announce the release of
our new website and documentation using
the new toolchain with Hugo and AsciiDoctor.

To get more information about the new toolchain
please read the FreeBSD Documentation Project Primer[1],
Hugo docs[2] and AsciiDoctor docs[3].

Acknowledgment:
Benedict Reuschling <bcr@>
Glen Barber <gjb@>
Hiroki Sato <hrs@>
Li-Wen Hsu <lwhsu@>
Sean Chittenden <seanc@>
The FreeBSD Foundation

[1] https://docs.FreeBSD.org/en/books/fdp-primer/
[2] https://gohugo.io/documentation/
[3] https://docs.asciidoctor.org/home/

Approved by:    doceng, core

documentation/static/pgpkeys/slavash.key

@@ -0,0 +1,67 @@
+// $FreeBSD: head/share/pgpkeys/slavash.key 51473 2018-03-08 12:51:09Z slavash $
+//
+// sh addkey.sh slavash F98A03ECA8FFFD9D ;
+
+
+[.literal-block-margin]
+....
+pub   rsa2048/F98A03ECA8FFFD9D 2018-02-20 [SC] [expires: 2021-02-19]
+      Key fingerprint = 7B5B EF93 06FC A8F9 38D0  C32F F98A 03EC A8FF FD9D
+uid                            Slava Shwartsman <slavash@freebsd.org>
+uid                            Slava Shwartsman <slava.shwartsman@gmail.com>
+uid                            Slava Shwartsman <valyushash@gmail.com>
+sub   rsa2048/63E8D18A494FE57D 2018-02-20 [E] [expires: 2021-02-19]
+
+....
+
+[.literal-block-margin]
+....
+-----BEGIN PGP PUBLIC KEY BLOCK-----
+
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+=ahs5
+-----END PGP PUBLIC KEY BLOCK-----
+....
+