Doc: Use a standard documentation config for a Qt module - Rename index.html to qtcharts-index.html - Use the qt-module-defaults global doc template - Convert 'indexes' into 'depends' - Remove custom buildversion string - Remove Q_INVOKABLE as ignore token, it's already listed in the global config - Use a namespace consistent with the rest of Qt modules - Update examplesinstallpath to the changes introduced in Qt 5.6 packaging. - Remove unnecessary \keyword on the landing page, as it may conflict with other modules' docs. Change-Id: I5cc0ff026b02bae22a415d82e36cb945bd19ae53 Reviewed-by: Leena Miettinen <riitta-leena.miettinen@theqtcompany.com>