Prepare documentation (#57)

* Updated the readme file to point to the official documentation

* first commit of new documentation structure

* split up and reconfigured Using rocJpeg

* Updated the readme file to point to the official documentation

* first commit of new documentation structure

* split up and reconfigured Using rocJpeg

* fixed missing space

* All changes asked for in the PR except the Destroy Handles part.

* separated creating and destroying handles; added a destroying handles section; added links to hipmalloc() and hipfree()

* removed the installation and build sections so that it doesn't conflict/go out of sync with the official doc

* putting readme back the way it was, minus documentation section

* changed some wording around hipFree()

[ROCm/rocjpeg commit: 31610c7472]

projects/rocjpeg/docs/sphinx/_toc.yml.in

@@ -8,29 +8,37 @@ subtrees:
 
 - caption: Install
   entries:
-  - file: install/quick-start.rst
-    title: Quick-start
-  - file: install/install.md
-    title: Installation guide
-
-- caption: API reference
-  entries:
-  - file: doxygen/html/files
-    title: API library
-  - file: doxygen/html/globals
-    title: Functions
-  - file: doxygen/html/annotated
-    title: Data structures
+  - file: install/rocjpeg-prerequisites.rst
+    title: rocJPEG installation prerequisites
+  - file: install/rocjpeg-package-install.rst
+    title: Installing rocJPEG with the package installer
+  - file: install/rocjpeg-build-and-install.rst
+    title: Building and installing rocJPEG from source code
 
 - caption: How to
   entries:
   - file: how-to/using-rocjpeg.rst
-    title: Use rocJPEG
+    title: Using rocJPEG
+  - file: how-to/rocjpeg-retrieve-image-info.rst
+    title: Retrieving image information with rocJPEG
+  - file: how-to/rocjpeg-decoding-a-jpeg-stream.rst
+    title: Decoding a JPEG stream with rocJPEG
 
-- caption: Tutorials
+- caption: Reference
+  entries:
+  - file: reference/rocjpeg-formats-and-architectures.rst
+    title: rocJPEG subsampling and hardware capabilities
+  - file: doxygen/html/files
+    title: rocJPEG API library
+  - file: doxygen/html/globals
+    title: rocJPEG functions
+  - file: doxygen/html/annotated
+    title: rocJPEG data structures
+
+- caption: Samples
   entries:
   - url: https://github.com/ROCm/rocJPEG/tree/develop/samples
-    title: GitHub samples
+    title: rocJPEG samples on GitHub
 
 - caption: About
   entries: