Rearrange the documentation for 2.0

CITATION.rst

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+Citing ccdproc
+--------------
+
+If you use ccdproc for a project that leads to a publication,
+whether directly or as a dependency of another package, please include
+the following acknowledgment:
+
+.. code-block:: text
+
+    This research made use of ccdproc, an Astropy package for
+    image reduction (Craig et al. 20XX).
+
+where (Craig et al. 20XX) is a citation to the `Zenodo record
+<https://doi.org/10.5281/zenodo.1069648>`_ of the ccdproc version
+that was used.  We also encourage citations in the main text wherever
+appropriate.
+
+For example, for ccdprpoc v1.3.0.post1 one would cite Craig et al. 2017
+with the BibTeX entry (https://zenodo.org/record/1069648/export/hx):
+
+.. code-block:: text
+
+
+  @misc{matt_craig_2017_1069648,
+      author       = {Matt Craig and Steve Crawford and Michael Seifert and
+                      Thomas Robitaille and Brigitta Sip{\H o}cz and
+                      Josh Walawender and Z\`e Vin{\'{\i}}cius and Joe Philip Ninan and Michael Droettboom and Jiyong Youn and
+                      Erik Tollerud and Erik Bray and
+                      Nathan Walker and VSN Reddy Janga and
+                      Connor Stotts and Hans Moritz G{\"u}nther and Evert Rol and
+                      Yoonsoo P. Bach and Larry Bradley and Christoph Deil and
+                      Adrian Price-Whelan and Kyle Barbary and Anthony Horton and
+                      William Schoenell and Nathan Heidt and Forrest Gasdia and
+                      Stefan Nelson and Ole Streicher},
+      title        = {astropy/ccdproc: v1.3.0.post1},
+      month        = dec,
+      year         = 2017,
+      doi          = {10.5281/zenodo.1069648},
+      url          = {https://doi.org/10.5281/zenodo.1069648}
+  }
+
+All ccdproc versions (and more citation formats) can be found at
+https://doi.org/10.5281/zenodo.1069648.

CODE_OF_CONDUCT.rst

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+Code of Conduct
+===============
+
+Ccdproc is an `Astropy`_  affiliated
+package and we follow the `Astropy Community Code of Conduct
+<http://www.astropy.org/code_of_conduct.html>`_.