Convert mobile.md to mobile.rst

I want this file to be in rst so that I can use some rst features in it
in future commits. The main changes in order to translate from markdown
to rst are:

* Inline `<code>` requires double-backticks not single

* These titles don't work:

  ```
  # Heading

  ## Subheading
  ```

  They should be:

  ```
  Heading
  =======

  Subheading
  ----------
  ```

* To get an auto-numbered list, repeatedly using 1 doesn't work:

  ```
  1. First item
  1. Second item
  1. Third item
  ```

  Instead use `#`:

  ```
  #. First item
  #. Second item
  #. Third item
  ```

* Paragraphs starting with `**Tip**:` (and with the contents in italics)
  now become proper tip blocks:

  ```
  .. tip::

     If the output of ``hostname`` does not include a ``.home`` or ``.local``
     suffix, you may need to append ``.local`` to get a host name that is accessible from
     other devices on the network. If you have problems using the host name, try
     using the IP address instead.
  ```

  Sphinx renders these boxes as `<div class="admonition tip">` and
  they're styled by your Sphinx theme (as opposed to hardcoding the tip
  is in bold and the body is italics but otherwise it's just a `<p>`).

* Code blocks are like this:

  ```
  .. code-block:: sh

     First line of code
     Second line of code
  ```

docs/developers/mobile.md

-# Mobile Development
-
-## Testing the Client on a Mobile Device
-
-If you have made changes to the client that could affect the mobile experience, it is a good idea to test them on a real device. Such changes should ideally be tested with at least current versions of iOS Safari and Chrome for Android.
-
-1. Make sure your development system and mobile device are on the same local network.
-1. Configure the "h" service to allow incoming connections from other systems by editing `conf/development-app.ini` and changing the `host` setting from `localhost` to `0.0.0.0`.
-1. Get the IP address or host name of your development system (`<HOSTNAME>` in the steps below). You can do this using the `hostname` terminal command on Mac/Linux.
-
-   **Tip:** _If the output of `hostname` does not include a `.home` or `.local`
-   suffix, you may need to append `.local` to get a host name that is accessible from
-   other devices on the network. If you have problems using the host name, try
-   using the IP address instead._
-1. Configure the "h" service to load the client from this host and start the dev
-   server:
-   ```sh
-   # In the "h" repository
-
-   # Configure the URL that the client is loaded from in pages
-   # that embed Hypothesis
-   export CLIENT_URL=http://<HOSTNAME>:3001/hypothesis
-
-   make dev
-   ```
-1. Configure the client to load assets from this hostname and start the dev
-   server:
-   ```sh
-   # In the "client" repository
-
-   # Set URL which sidebar app ("app.html") is loaded from
-   export H_SERVICE_URL=http://<HOSTNAME>:5000
-   # Set hostname used when generating client asset URLs
-   export PACKAGE_SERVER_HOSTNAME=<HOSTNAME>
-
-   gulp watch
-   ```
-   **Tip:** _When `gulp watch` runs, it will print out the URLs used for the "h" service and client assets. These should include `<HOSTNAME>` instead of `localhost`._
-1. On your mobile device, go to a page which has the client embedded such as `http://<HOSTNAME>:3000` or `http://<HOSTNAME>:5000/docs/help`.

docs/developers/mobile.rst

+Mobile Development
+==================
+
+Testing the Client on a Mobile Device
+-------------------------------------
+
+If you have made changes to the client that could affect the mobile experience, it is a good idea to test them on a real device. Such changes should ideally be tested with at least current versions of iOS Safari and Chrome for Android.
+
+#. Make sure your development system and mobile device are on the same local network.
+
+#. Configure the "h" service to allow incoming connections from other systems by editing ``conf/development-app.ini`` and changing the ``host`` setting from ``localhost`` to ``0.0.0.0``.
+
+#. Get the IP address or host name of your development system (``<HOSTNAME>`` in the steps below). You can do this using the ``hostname`` terminal command on Mac/Linux.
+
+   .. tip::
+
+      If the output of ``hostname`` does not include a ``.home`` or ``.local``
+      suffix, you may need to append ``.local`` to get a host name that is accessible from
+      other devices on the network. If you have problems using the host name, try
+      using the IP address instead.
+
+#. Configure the "h" service to load the client from this host and start the dev
+   server:
+
+   .. code-block:: sh
+
+      # In the "h" repository
+
+      # Configure the URL that the client is loaded from in pages
+      # that embed Hypothesis
+      export CLIENT_URL=http://<HOSTNAME>:3001/hypothesis
+
+      make dev
+
+#. Configure the client to load assets from this hostname and start the dev
+   server:
+
+   .. code-block:: sh
+
+      # In the "client" repository
+
+      # Set URL which sidebar app ("app.html") is loaded from
+      export H_SERVICE_URL=http://<HOSTNAME>:5000
+      # Set hostname used when generating client asset URLs
+      export PACKAGE_SERVER_HOSTNAME=<HOSTNAME>
+
+      gulp watch
+
+   .. tip::
+
+      When ``gulp watch`` runs, it will print out the URLs used for the "h" service and client assets. These should include ``<HOSTNAME>`` instead of ``localhost``.
+
+#. On your mobile device, go to a page which has the client embedded such as ``http://<HOSTNAME>:3000`` or ``http://<HOSTNAME>:5000/docs/help``.