Link: Fix external links

This changes direct links to relative links to the internal page.
Glob_Patterns.rst,Install.rst and Tutorial.rst are changed.

Closes #595

Users/Glob_Patterns.rst

@@ -13,8 +13,7 @@ Suppose you want ``SpaceConsistencyBear`` to perform an analysis on a file
 .. note::
 
     If you don't know the functions of a bear or how to perform the analysis
-    with a bear, you should go through `Tutorial
-    <http://coala.readthedocs.io/en/latest/Users/Tutorial.html>`_ first.
+    with a bear, you should go through :doc:`Tutorial <Tutorial>` first.
 
 Now, if you want all the ``.c`` files in a specific directory to be analysed,
 you can take help of glob patterns.
@@ -82,8 +81,7 @@ The special characters used in shell-style wildcards are:
 
     If you're looking for a negation pattern to exclude paths, check out the
     ``--ignore`` argument or ``ignore`` .coafile option `here
-    <http://coala.readthedocs.io/en/latest/Users/Tutorial.html#ignoring
-    -issues>`_.
+    <Tutorial.html#ignoring-issues>`_.
 
 Examples
 --------

Users/Install.rst

@@ -341,7 +341,7 @@ Shell-Autocompletion Support
 ----------------------------
 
 If you are a bash/zsh user , checkout the
-`guide <https://docs.coala.io/en/latest/Users/Shell_Autocompletion.html>`_
+:doc:`guide <Shell_Autocompletion>`
 to set up autocompletion for coala arguments and bear names.
 
 

Users/Tutorial.rst

@@ -42,7 +42,7 @@ Command Line Interface
 
 In order to specify the files to analyze, you can use the ``--files``
 argument of coala like demonstrated below. For all file paths, you can
-specify (recursive) `globs <../Users/Glob_Patterns.html>`__.
+specify (recursive) :doc:`globs <Glob_Patterns>`.
 
 Because analysis routines can do many various things we named them
 **bears**. A bear can check your code for potential problems, calculate metrics