docs: use https links (GH-4067)

CHANGES.rst

@@ -3511,7 +3511,7 @@ Features added
 
 * Extension type inheritance from builtin types, such as "cdef class MyUnicode(unicode)", now works without further external type redeclarations (which are also strongly discouraged now and continue to issue a warning).
 
-* GDB support. http://docs.cython.org/src/userguide/debugging.html
+* GDB support. https://docs.cython.org/src/userguide/debugging.html
 
 * A new build system with support for inline distutils directives, correct dependency tracking, and parallel compilation. https://github.com/cython/cython/wiki/enhancements-distutils_preprocessing
 

README.rst

@@ -15,7 +15,7 @@ This makes Cython the ideal language for wrapping external C libraries, and
 for fast C modules that speed up the execution of Python code.
 
 * Official website: https://cython.org/
-* Documentation: http://docs.cython.org/
+* Documentation: https://docs.cython.org/
 * Github repository: https://github.com/cython/cython
 * Wiki: https://github.com/cython/cython/wiki
 
@@ -31,7 +31,7 @@ If you already have a C compiler, just run following command::
 
    pip install Cython
 
-otherwise, see `the installation page <http://docs.cython.org/en/latest/src/quickstart/install.html>`_.
+otherwise, see `the installation page <https://docs.cython.org/en/latest/src/quickstart/install.html>`_.
 
 
 License:
@@ -85,7 +85,7 @@ Copyright stuff: Pyrex is free of restrictions. You
 may use, redistribute, modify and distribute modified
 versions.
 
-The latest version of Pyrex can be found `here <http://www.cosc.canterbury.ac.nz/~greg/python/Pyrex/>`_.
+The latest version of Pyrex can be found `here <https://www.cosc.canterbury.ac.nz/~greg/python/Pyrex/>`_.
 
 | Greg Ewing, Computer Science Dept
 | University of Canterbury

docs/examples/Cython Magics.ipynb

@@ -356,7 +356,7 @@
      "cell_type": "markdown",
      "metadata": {},
      "source": [
-      "You can similarly use the `-I/--include` flag to add include directories to the search path, and `-c/--compile-args` to add extra flags that are passed to Cython via the `extra_compile_args` of the distutils `Extension` class.  Please see [the Cython docs on C library usage](http://docs.cython.org/src/tutorial/clibraries.html) for more details on the use of these flags."
+      "You can similarly use the `-I/--include` flag to add include directories to the search path, and `-c/--compile-args` to add extra flags that are passed to Cython via the `extra_compile_args` of the distutils `Extension` class.  Please see [the Cython docs on C library usage](https://docs.cython.org/src/tutorial/clibraries.html) for more details on the use of these flags."
      ]
     }
    ],

docs/make.bat

@@ -56,7 +56,7 @@ if errorlevel 9009 (
 	echo.may add the Sphinx directory to PATH.
 	echo.
 	echo.If you don't have Sphinx installed, grab it from
-	echo.http://sphinx-doc.org/
+	echo.https://sphinx-doc.org/
 	exit /b 1
 )
 

docs/src/quickstart/overview.rst

@@ -47,7 +47,7 @@ language.
    The Cython compiler, https://cython.org/.
 .. [IronPython] Jim Hugunin et al., https://archive.codeplex.com/?p=IronPython.
 .. [Jython] J. Huginin, B. Warsaw, F. Bock, et al.,
-   Jython: Python for the Java platform, http://www.jython.org.
+   Jython: Python for the Java platform, https://www.jython.org.
 .. [PyPy] The PyPy Group, PyPy: a Python implementation written in Python,
    https://pypy.org/.
 .. [Pyrex] G. Ewing, Pyrex: C-Extensions for Python,

docs/src/tutorial/appendix.rst

@@ -2,7 +2,7 @@ Appendix: Installing MinGW on Windows
 =====================================
 
  1. Download the MinGW installer from
-    http://www.mingw.org/wiki/HOWTO_Install_the_MinGW_GCC_Compiler_Suite.
+    https://www.mingw.org/wiki/HOWTO_Install_the_MinGW_GCC_Compiler_Suite.
     (As of this
     writing, the download link is a bit difficult to find; it's under
     "About" in the menu on the left-hand side). You want the file

docs/src/tutorial/clibraries.rst

@@ -24,7 +24,7 @@ decide to use its double ended queue implementation.  To make the
 handling easier, however, you decide to wrap it in a Python extension
 type that can encapsulate all memory management.
 
-.. [CAlg] Simon Howard, C Algorithms library, http://c-algorithms.sourceforge.net/
+.. [CAlg] Simon Howard, C Algorithms library, https://fragglet.github.io/c-algorithms/
 
 
 Defining external declarations

docs/src/tutorial/readings.rst

 Further reading
 ===============
 
-The main documentation is located at http://docs.cython.org/. Some
+The main documentation is located at https://docs.cython.org/. Some
 recent features might not have documentation written yet, in such
 cases some notes can usually be found in the form of a Cython
 Enhancement Proposal (CEP) on https://github.com/cython/cython/wiki/enhancements.

docs/src/userguide/numpy_tutorial.rst

@@ -61,7 +61,7 @@ Using Cython consists of these steps:
 
 However there are several options to automate these steps:
 
-1. The `SAGE <http://sagemath.org>`_ mathematics software system provides
+1. The `SAGE <https://sagemath.org>`_ mathematics software system provides
    excellent support for using Cython and NumPy from an interactive command
    line or through a notebook interface (like
    Maple/Mathematica). See `this documentation