Included demos videos for flight search, captcha, and custom functions (#38)

* Add captcha demo gif

* Captcha demo

* Host gif at imgur

* Try to include from other repo

* Hugging face example

* Try to display mp4

* Include mp4 with raw link

* Try with git user content .com

* More methods

* Update README.md

* Add custom function

* Try with only the link

* Readme update

* Display video

* Flight search example

* Update README.md

* Update prompts

* Prompts above videos

* Space between div and video

* Font size