update links in documentation

In addition to basic updates to skip permanent redirect, remove an
obsolete reference to macports installation instructions on the main
website.

AUTHORS.rst

@@ -7,7 +7,7 @@ The Kwant authors can be reached at authors@kwant-project.org.
 The principal developers of Kwant are
 
 * `Christoph W. Groth <mailto://christoph.groth@cea.fr>`_ (INAC/CEA Grenoble)
-* `Michael Wimmer <http://michaelwimmer.org>`_ (TU Delft)
+* `Michael Wimmer <https://michaelwimmer.org>`_ (TU Delft)
 * `Anton R. Akhmerov <http://antonakhmerov.org>`_ (TU Delft)
 * `Xavier Waintal <http://inac.cea.fr/Pisp/xavier.waintal>`_ (INAC/CEA Grenoble)
 * `Joseph Weston <http://josephweston.org>`_ (INAC/CEA Grenoble)

INSTALL.rst

@@ -32,7 +32,7 @@ Building Kwant requires
  * `Python <https://www.python.org/>`_ 3.4 or above (Kwant 1.1 is the last
    version to support Python 2),
  * `NumPy <http://numpy.org/>`_ 1.8.1 or newer,
- * `SciPy <http://scipy.org/>`_ 0.13.3 or newer,
+ * `SciPy <https://scipy.org/>`_ 0.13.3 or newer,
  * `LAPACK <http://netlib.org/lapack/>`_ and `BLAS <http://netlib.org/blas/>`_,
    (For best performance we recommend the free `OpenBLAS
    <http://www.openblas.net/>`_ or the nonfree `MKL
@@ -156,7 +156,7 @@ Building the documentation
 To build the documentation, the `Sphinx documentation generator
 <http://www.sphinx-doc.org/en/stable/>`_ is required with ``numpydoc`` extension
 (version 0.5 or newer).  If PDF documentation is to be built, the tools
-from the `libRSVG <http://live.gnome.org/LibRsvg>`_ (Debian/Ubuntu package
+from the `libRSVG <https://wiki.gnome.org/action/show/Projects/LibRsvg>`_ (Debian/Ubuntu package
 ``librsvg2-bin``) are needed to convert SVG drawings into the PDF format.
 
 As a prerequisite for building the documentation, Kwant must have been built
@@ -216,11 +216,7 @@ systems. Here we only consider the case of `MacPorts
 below.
 
 1. Install a recent version of MacPorts, as explained in the `installation
-   instructions of MacPorts <https://www.macports.org/install.php>`_.  `The
-   MacPorts section of the Kwant website
-   <https://kwant-project.org/install#mac-os-x-macports>`_ may be also of
-   interest.  (Note that it describes how to install Kwant using a ports file,
-   while the aim here is to install from source manually.)
+   instructions of MacPorts <https://www.macports.org/install.php>`_.
 
 2. Install the required dependencies::
 

doc/source/reference/kwant.solvers.sparse.rst

@@ -4,7 +4,7 @@
 .. module:: kwant.solvers.sparse
 
 This solver uses SciPy's `scipy.sparse.linalg
-<http://docs.scipy.org/doc/scipy/reference/sparse.linalg.html>`_.  The
+<https://docs.scipy.org/doc/scipy/reference/sparse.linalg.html>`_.  The
 interface is identical to that of the :mod:`default solver
 <kwant.solvers.default>`.
 

doc/source/tutorial/first_steps.rst

@@ -325,7 +325,7 @@ subbands that increases with energy.
 
 .. rubric:: Footnotes
 
-.. [#] http://xkcd.com/353/
+.. [#] https://xkcd.com/353/
 .. [#] Leads are numbered in the python convention, starting from 0.
 
 Building the same system with less code

doc/source/tutorial/spectrum.rst

@@ -71,7 +71,7 @@ In this example, we compute the wave functions of a closed circular quantum dot
 and its spectrum as a function of magnetic field (Fock-Darwin spectrum).
 
 To compute the eigenenergies and eigenstates, we will make use of the sparse
-linear algebra functionality of `SciPy <http://www.scipy.org>`_, which
+linear algebra functionality of `SciPy <https://www.scipy.org>`_, which
 interfaces the ARPACK package:
 
 .. literalinclude:: closed_system.py
@@ -139,7 +139,7 @@ it using `kwant.plotter.current`:
     matrix, if the optional argument ``sparse=True``. The sparse matrix is in
     SciPy's ``scipy.sparse.coo_matrix`` format, which can be easily be converted
     to various other sparse matrix formats (see `SciPy's documentation
-    <http://docs.scipy.org/doc/scipy/reference/>`_).
+    <https://docs.scipy.org/doc/scipy/reference/>`_).
 
 .. rubric:: Footnotes