Remove outdated C spec PDF to avoid confusion.  Remove "2.2" on registry index from what is now the unified extension spec. (#61)

index.php

diff --git a/index.php b/index.php
index 1349bdb..3fb27e5 100644
--- a/index.php
+++ b/index.php
@@ -36,7 +36,7 @@
      (<a href="specs/2.2/html/OpenCL_API.html">HTML</a>)
      (<a href="specs/2.2/pdf/OpenCL_API.pdf">PDF</a>)
      (February 5, 2019). </li>
-<li> OpenCL 2.2 Extension Specification
+<li> OpenCL Extension Specification
      (<a href="specs/2.2/html/OpenCL_Ext.html">HTML</a>)
      (<a href="specs/2.2/pdf/OpenCL_Ext.pdf">PDF</a>)
      (February 5, 2019). </li>

specs/opencl-2.0-openclc.pdf

diff --git a/specs/opencl-2.0-openclc.pdf b/specs/opencl-2.0-openclc.pdf
deleted file mode 100644
index d92c8f1..0000000
--- a/specs/opencl-2.0-openclc.pdf
+++ /dev/null
Binary files differ