DOC: Update broken links from docs (#272)

docs/dev/contributing.rst

@@ -7,7 +7,7 @@ If you're reading this, you're probably looking to contributing to Camelot. *Tim
 
 This document will help you get started with contributing documentation, code, testing and filing issues. If you have any questions, feel free to reach out to `Vinayak Mehta`_, the author and maintainer.
 
-.. _Vinayak Mehta: https://www.vinayakmehta.com
+.. _Vinayak Mehta: https://vinayak.io
 
 Code Of Conduct
 ---------------
@@ -18,7 +18,7 @@ The following quote sums up the **Code Of Conduct**.
 
 Kenneth Reitz has also written an `essay`_ on this topic, which you should read.
 
-.. _essay: https://www.kennethreitz.org/essays/2013/01/27/be-cordial-or-be-on-your-way
+.. _essay: https://kennethreitz.org/essays/2013/01/27/be-cordial-or-be-on-your-way
 
 As the `Requests Code Of Conduct`_ states, **all contributions are welcome**, as long as everyone involved is treated with respect.
 

docs/user/advanced.rst

@@ -362,7 +362,7 @@ Improve guessed table areas
 
 While using :ref:`Stream <stream>`, automatic table detection can fail for PDFs like `this one <https://github.com/camelot-dev/camelot/blob/master/tests/files/edge_tol.pdf>`_. That's because the text is relatively far apart vertically, which can lead to shorter textedges being calculated.
 
-.. note:: To know more about how textedges are calculated to guess table areas, you can see pages 20, 35 and 40 of `Anssi Nurminen's master's thesis <http://dspace.cc.tut.fi/dpub/bitstream/handle/123456789/21520/Nurminen.pdf?sequence=3>`_.
+.. note:: To know more about how textedges are calculated to guess table areas, you can see pages 20, 35 and 40 of `Anssi Nurminen's master's thesis <https://trepo.tuni.fi/bitstream/handle/123456789/21520/Nurminen.pdf?sequence=3>`_.
 
 Let's see the table area that is detected by default.