doc-rst: customize RTD theme, captions & inline literal

The layout of (table) captions in the RTD theme is a bit ugly and the
bordered, red colored of inline literals is a bit to gaudy. The
requirements has been discussed in the ML [1].

captions:

  - captions should have 100% (not 85%) font size
  - hide the permalink symbol as long as link is not hovered

inline literal:

  - drop the borderbox and red color

[1] http://article.gmane.org/gmane.linux.drivers.video-input-infrastructure/101099Signed-off-by: Markus Heiser <markus.heiser@darmarIT.de>

Documentation/sphinx-static/theme_overrides.css

@@ -25,4 +25,29 @@
     .wy-table-responsive { overflow: auto; }
     .rst-content table.docutils caption { text-align: left; font-size: 100%; }
 
+    /* captions:
+     *
+     *   - captions should have 100% (not 85%) font size
+     *   - hide the permalink symbol as long as link is not hovered
+     */
+
+    caption, .wy-table caption, .rst-content table.field-list caption {
+        font-size: 100%;
+    }
+    caption a.headerlink { opacity: 0; }
+    caption a.headerlink:hover { opacity: 1; }
+
+    /* inline literal: drop the borderbox and red color */
+
+    code, .rst-content tt, .rst-content code {
+        color: inherit;
+        border: none;
+        background: inherit;
+        font-size: 85%;
+    }
+
+    .rst-content tt.literal,.rst-content tt.literal,.rst-content code.literal {
+        color: inherit;
+    }
+
 }