doc: Move recommendations under /rec.

Signed-off-by: Tommi Virtanen <tommi.virtanen@dreamhost.com>

doc/index.rst

@@ -89,6 +89,7 @@ Table of Contents
    tutorial
    architecture
    ops/index
+   rec/index
    api/index
    Internals <dev/index>
    man/index

doc/ops/index.rst

@@ -9,9 +9,6 @@
    config
    radosgw
    rbd
-   hardware
-   filesystem
    monitor
    data-placement
    autobuilt
-   misc

doc/ops/misc.rst

@@ -1,14 +0,0 @@
-===============
- Miscellaneous
-===============
-
-.. todo:: This section should not exist. Try to reorganize, when
-   document is otherwise more ready.
-
-
-Disabling encryption
-====================
-
-Authentication is optional but very much recommended.
-
-.. todo:: write me

doc/rec/crypto.rst

@@ -0,0 +1,7 @@
+========================
+ Disabling cryptography
+========================
+
+Authentication is optional but very much recommended.
+
+.. todo:: write me

doc/rec/hardware.rst

@@ -2,9 +2,6 @@
  Hardware recommendations
 ==========================
 
-Hardware requirements and tradeoffs
-===================================
-
 Discussing the hardware requirements for each daemon, the tradeoffs of
 doing one cosd per machine versus one per disk, and hardware-related
 configuration options like journaling locations.

doc/rec/index.rst

@@ -0,0 +1,15 @@
+=================
+ Recommendations
+=================
+
+There are several ways to set up a storage system. Often, the nature
+of the load means different tradeoffs make sense for different
+installations. This section aims to walk through some common
+scenarios, and inform you on how to decide what is best for your
+cluster.
+
+.. toctree::
+
+   hardware
+   filesystem
+   crypto