Minor tweaks to README and style guide to reflect new build system.

[ardour-manual] / include / session-properties-dialog.html

<img src="/images/a4_session_properties_timecode.png" alt="session properties dialog"/>

<p>
  This dialog allows you to change settings for the current session. These settings
  are initially set from the template used to create the session. To open the dialog
  use <kbd class="menu">Session &gt; Properties</kbd>
</p>

{% children %}