* docs: added fiddle support for code samples in quick start guide and features
* docs: removed excessive fiddle links for not final steps
* docs: added eof newlines to fiddle examples
* docs: reworked fiddle examples to be more self-sufficient
* docs: reworked fiddle examples according to mentions
* docs: changed http to https in the offscreen rendering fiddle
* docs: fix recent documents fiddle to be more consistent
* docs: revised the application progress bar feature page
* docs: fixed mentions, added screenshots to make the guide more consistent
* docs: added an extra phrase about indeterminate mode
* docs: revised paragraph about indeterminate mode
* docs: fixed lint errors, broken links
