Create a new 'Techniques' category in documentation.

Re #19921

docs/source/index.rst

@@ -23,6 +23,7 @@ Mantid Documentation
    algorithms/index
    algorithms/*
    concepts/index
+   techniques/index
    interfaces/index
    fitfunctions/*
    fitminimizers/index
@@ -41,6 +42,7 @@ This is the documentation for Mantid |release|.
 
 * `Algorithms <algorithms/index.html>`_
 * `Concepts <concepts/index.html>`_
+* `Techniques <techniques/index.html>`_
 * `Interfaces <interfaces/index.html>`_
 * `Fit Functions <fitfunctions/index.html>`_
 * `Fit Minimizers <fitminimizers/index.html>`_

docs/source/techniques/index.rst

+.. Techniques master file
+   It contains a hidden root toctree directive so that Sphinx
+   has an internal index of all of the pages and doesn't
+   produce a plethora of warnings about most documents not being in
+   a toctree.
+   See http://sphinx-doc.org/tutorial.html#defining-document-structure
+
+.. _techniques contents:
+
+============
+ Techniques
+============
+
+.. toctree::
+   :hidden:
+   :glob:
+   :maxdepth: 1
+
+   *

docs/sphinxext/mantiddoc/directives/categories.py

@@ -20,7 +20,7 @@ CATEGORIES_DIR = "categories"
 # List of category names that are considered the index for everything in that type
 # When this category is encountered an additional index.html is written to both the
 # directory of the document and the category directory
-INDEX_CATEGORIES = ["Algorithms", "FitFunctions", "Concepts", "Interfaces"]
+INDEX_CATEGORIES = ["Algorithms", "FitFunctions", "Concepts", "Techniques", "Interfaces"]
 
 class LinkItem(object):
     """