fix broken links to PDF documentation in the Sage documentation

Author: strogdon

build/pkgs/sagemath_doc_html/spkg-install

@@ -1,3 +1,6 @@
 #! /usr/bin/env bash
 cd $SAGE_ROOT/src/doc
 $MAKE doc-html
+if [ ! -e $SAGE_LOCAL/share/doc/sage/html/en/web_pdf ] ; then
+    ln -sr $SAGE_LOCAL/share/doc/sage/html/en/../.. $SAGE_LOCAL/share/doc/sage/html/en/web_pdf
+fi

src/doc/en/website/templates/index.html

@@ -41,7 +41,7 @@ <h2>
         <a class="biglink" href="tutorial/index.html">
           Tutorial
         </a>
-        <a title="Download PDF" class="pdf" href="../../pdf/en/tutorial/SageTutorial.pdf">
+        <a title="Download PDF" class="pdf" href="web_pdf/pdf/en/tutorial/SageTutorial.pdf">
           <img class="icon" src="_static/pdf.png"></img>
         </a>
         <br>
@@ -57,7 +57,7 @@ <h2>
         <a class="biglink" href="faq/index.html">
           FAQs
         </a>
-        <a title="Download PDF" class="pdf" href="../../pdf/en/faq/faq.pdf">
+        <a title="Download PDF" class="pdf" href="web_pdf/pdf/en/faq/faq.pdf">
           <img class="icon" src="_static/pdf.png"></img>
         </a>
         <br>
@@ -81,7 +81,7 @@ <h2>
           Thematic Tutorials
         </a>
         <a title="Download PDF" class="pdf"
-           href="../../pdf/en/thematic_tutorials/thematic_tutorials.pdf">
+           href="web_pdf/pdf/en/thematic_tutorials/thematic_tutorials.pdf">
           <img class="icon" src="_static/pdf.png"></img>
         </a>
         <br>
@@ -102,7 +102,7 @@ <h2>
         <a class="biglink" href="prep/index.html">
           PREP Tutorials
         </a>
-        <a title="Download PDF" class="pdf" href="../../pdf/en/prep/prep_tutorials.pdf">
+        <a title="Download PDF" class="pdf" href="web_pdf/pdf/en/prep/prep_tutorials.pdf">
           <img class="icon" src="_static/pdf.png"></img>
         </a>
         <br>
@@ -137,7 +137,7 @@ <h2>
         <a class="biglink" href="reference/index.html">
           Reference Manual
         </a>
-        <a title="Link to PDF" class="pdf" href="../../pdf/en/reference/index.html">
+        <a title="Link to PDF" class="pdf" href="web_pdf/pdf/en/reference/index.html">
           <img class="icon" src="_static/pdf.png"></img>
         </a>
         <br>
@@ -178,7 +178,7 @@ <h2>
         <a class="biglink" href="installation/index.html">
           Installation Guide
         </a>
-        <a title="Download PDF" class="pdf" href="../../pdf/en/installation/installation.pdf">
+        <a title="Download PDF" class="pdf" href="web_pdf/pdf/en/installation/installation.pdf">
           <img class="icon" src="_static/pdf.png"></img>
         </a>
         <br>
@@ -196,7 +196,7 @@ <h2>
         <a class="biglink" href="developer/index.html">
           Developer's Guide
         </a>
-        <a title="Download PDF" class="pdf" href="../../pdf/en/developer/developer.pdf">
+        <a title="Download PDF" class="pdf" href="web_pdf/pdf/en/developer/developer.pdf">
           <img class="icon" src="_static/pdf.png"></img>
         </a>
         <br>
@@ -231,7 +231,7 @@ <h2>
         <a class="biglink" href="a_tour_of_sage/index.html">
           A Tour of Sage
         </a>
-        <a title="Download PDF" class="pdf" href="../../pdf/en/a_tour_of_sage/a_tour_of_sage.pdf">
+        <a title="Download PDF" class="pdf" href="web_pdf/pdf/en/a_tour_of_sage/a_tour_of_sage.pdf">
           <img class="icon" src="_static/pdf.png"></img>
         </a>
         <br>
@@ -248,7 +248,7 @@ <h2>
         <a class="biglink" href="constructions/index.html">
           Constructions
         </a>
-        <a title="Download PDF" class="pdf" href="../../pdf/en/constructions/constructions.pdf">
+        <a title="Download PDF" class="pdf" href="web_pdf/pdf/en/constructions/constructions.pdf">
           <img class="icon" src="_static/pdf.png"></img>
         </a>
         <br>