Some improvements to the Page Header and Tab UI. Original | New :--------:|:-------:  |   |   |   |   |  What? - Create a new Scaffold component, which includes the header and tabs required for a page. - Use this component to wrap all the views that have a header. - Ensures consistency in headers between different pages. - [x] Add support to use custom html/component in place of title (for repo page, pipeline page, etc) - [x] Add support of right icon buttons (for repo page, pipeline page, etc) - [x] Refactor tabs handling using compositions (useTabsProvider, useTabsClient) - [x] Make new header ui resposive
