Give up on multiple readthedocs PDFs

It doesn't appear possible to adapt the readthedocs build process to
generate multiple PDFs
(readthedocs/readthedocs.org#2045).
Instead, build Getting Started and Walkthough files locally and serve
them from doc/_static.

doc/conf.py

@@ -103,9 +103,9 @@
 #
 html_theme_options = {
     'extra_nav_links' : {
-        "Getting Started (PDF)": "https://buildmedia.readthedocs.org/media/pdf/MDTF-diagnostics/latest/MDTF_getting_started.pdf",
-        "Developer's Walkthough (PDF)": "https://buildmedia.readthedocs.org/media/pdf/MDTF-diagnostics/latest/MDTF_walkthrough.pdf",
-        "Full documentation (PDF)": "https://buildmedia.readthedocs.org/media/pdf/MDTF-diagnostics/latest/mdtf-diagnostics.pdf"
+        "Getting Started (PDF)": "https://mdtf-diagnostics.readthedocs.io/en/latest/_static/MDTF_getting_started.pdf",
+        "Developer's Walkthough (PDF)": "https://mdtf-diagnostics.readthedocs.io/en/latest/_static/MDTF_walkthrough.pdf",
+        "Full documentation (PDF)": "https://mdtf-diagnostics.readthedocs.io/_/downloads/en/latest/pdf/"
     }
 }
 
@@ -177,13 +177,13 @@
         u'MDTF Diagnostics Documentation', author, 'manual'
     ),
     (
-        'tex_getting_started', 'MDTF_getting_started.tex_', 
+        'tex_getting_started', 'MDTF_getting_started.tex', 
         u"MDTF Getting Started Guide", 
         r"Thomas Jackson (GFDL), Yi-Hung Kuo (UCLA), Dani Coleman (NCAR)", 
         'sphinxmdtfhowto'
     ),
     (
-        'tex_walkthrough', 'MDTF_walkthrough.tex_', 
+        'tex_walkthrough', 'MDTF_walkthrough.tex', 
         u"MDTF Developer's Walkthrough", 
         (
         r"Yi-Hung Kuo\textsuperscript{a} \and Dani Coleman\textsuperscript{b} "
@@ -197,7 +197,6 @@
 ]
 
 latex_additional_files = [
-    'latex/latexmkrc', 
     'latex/sphinxmdtfhowto.cls'
 ]