Internal links for Getting Started tutorial pages are broken

Redirection for following links is broken and these links need to be fixed:

1. getting-started/hello_world/ - "Creating the main window" link in Moving On section.
2. getting-started/main_window/ - "First Program Tutorial" link in Summary.
3. getting-started/main_window/ - "Using Actions" link in Moving On section.
4. getting-started/using_actions/ - "window" link in Introduction section.
5. getting-started/using_actions/ - Remove '>' character from "qApp" link so user lands at the correct section of qApp page on Qt documentation site.
6. getting-started/using_actions/ - "previous tutorial" link in CMakeLists.txt section.
7. getting-started/saving_and_loading/ - "previous tutorial" link in savingloadingui.rc section.
8. getting-started/saving_and_loading/ - "previous tutorial" link in Adding the actions section.
9. getting-started/saving_and_loading/ - "previous tutorial" link in Creating a new document section.
10. getting-started/saving_and_loading/ - Add a link(https://doc.qt.io/qt-5/qurl.html) for "QUrl" class under Loading a file section.
11. getting-started/saving_and_loading/ - "previous tutorial" link in Make,Install and Run section.