Replace AdwViewSwitcherTitle with AdwViewSwitcher

[Sahil-Shadwal]

Fixes #42

Updated AdwViewSwitcherTitle to Adw.ViewSwitcher and added policy to wide
Removed centering policy from Adw.HeaderBar and reveal from ViewSwitcherBar

[Sahil-Shadwal]

I am looking why it is showing error, if there is somethings specific you want me to change . Please let me know , thank you

[Sahil-Shadwal]

`Adw.HeaderBar {
centering-policy: strict;

  title-widget: Adw.ViewSwitcher switcher_title {
    policy: wide;
    stack: stack;
    title: _("AdwViewSwitcher Demo");
  };
}`

If i am removing centering policy it is showing error, but the resource you shared in that it is stated to :

Also remove the AdwViewSwitcherBar:reveal property binding on your switcher bar, and stop setting AdwHeaderBar:centering-policy on your header bar.

[sonnyp]

You can ask for help in https://matrix.to/#/#libadwaita:gnome.org

[Sahil-Shadwal]

Hey , i followed the documentation and even asked in the libadawaita community . Everything seems fine but it is not working as expected . @sonnyp can you check the gist .
https://gist.github.com/Sahil-Shadwal/ea9162c2f9c7c43ed2599b07a7e0e08b