Clean up a few links to take care of errors.

docs/source/developer/repo.rst

@@ -1,3 +1,5 @@
+.. _developer-guide:
+
 General Codebase Orientation
 ----------------------------
 

docs/source/developer/xkcd_extension_tutorial.rst

@@ -409,7 +409,7 @@ Rebuild your extension if necessary (``npm run build``), refresh your
 browser tab, and run the *Random xkcd comic* command again. You should
 now see a comic in the xkcd.com panel when it opens.
 
-|Empty xkcd extension panel|
+|Single xkcd extension panel|
 
 Note that the comic is not centered in the panel nor does the panel
 scroll if the comic is larger than the panel area. Also note that the
@@ -860,7 +860,7 @@ learning, here are some suggestions about what to try next:
 
 .. |Completed xkcd extension screenshot| image:: xkcd_tutorial_complete.png
 .. |Empty xkcd extension panel| image:: xkcd_tutorial_empty.png
-.. |Empty xkcd extension panel| image:: xkcd_tutorial_single.png
+.. |Single xkcd extension panel| image:: xkcd_tutorial_single.png
 .. |Styled xkcd panel with attribution| image:: xkcd_tutorial_complete.png
 .. |Extension page on npmjs.com| image:: xkcd_tutorial_npm.png
 

docs/source/getting_started/overview.rst

@@ -15,16 +15,16 @@ cells around a notebook or between notebooks with drag-and-drop).
 **JupyterLab has full support for Jupyter Notebook documents.** In
 addition, it enables other models of interactive computing, such as:
 
--  `Code Consoles <>`__ provide transient scratchpads for running code
+-  :ref:`code-consoles` provide transient scratchpads for running code
    interactively, with full support for rich output.
--  `Kernel-backed documents <>`__ allow code in any text file (Markdown,
+-  :ref:`Kernel-backed documents <kernel-backed-documents>` allow code in any text file (Markdown,
    Python, R, LaTeX, etc.) to be run interactively in any Jupyter
    kernel.
 
 JupyterLab also offers a unified model for viewing and handling data
 formats. This allows data in many formats (images, CSV, JSON, Markdown,
 PDF, Vega, Vega-Lite, etc.) to be opened as a file or returned by a
-kernel as rich output. See `File and output formats <>`__ for more
+kernel as rich output. See :ref:`file-and-output-formats` for more
 information.
 
 JupyterLab is served from the same

docs/source/user/code_console.rst

@@ -1,3 +1,5 @@
+.. _code-consoles:
+
 Code Consoles
 -------------
 

docs/source/user/documents_kernels.rst

@@ -1,3 +1,5 @@
+.. _kernel-backed-documents:
+
 Documents and kernels
 ~~~~~~~~~~~~~~~~~~~~~
 

docs/source/user/extensions.rst

@@ -6,7 +6,7 @@ They can provide new file viewer types, launcher activities, and output
 renderers, among many other things. JupyterLab extensions are
 `npm <https://www.npmjs.com/>`__ packages (the standard package format
 in Javascript development). For information about developing extensions,
-see the `developer documentation <>`__.
+see the :ref:`developer documentation <developer-guide>`.
 
 In order to install JupyterLab extensions, you need to have Node.js
 version 4+ installed.

docs/source/user/file_formats.rst

@@ -1,3 +1,5 @@
+.. _file-and-output-formats:
+
 File and output formats
 -----------------------