docs(readme): fix link to demo2 image (#589)

Author: joshka

README.md

@@ -21,7 +21,7 @@
 
 <!-- cargo-rdme start -->
 
-![Demo](https://raw.githubusercontent.com/ratatui-org/ratatui/aa09e59dc0058347f68d7c1e0c91f863c6f2b8c9/examples/demo2.gif)
+![Demo](https://raw.githubusercontent.com/ratatui-org/ratatui/b33c878808c4c40591d7a2d9f9d94d6fee95a96f/examples/demo2.gif)
 
 <div align="center">
 

src/lib.rs

@@ -1,6 +1,6 @@
 #![forbid(unsafe_code)]
 
-//! ![Demo](https://raw.githubusercontent.com/ratatui-org/ratatui/aa09e59dc0058347f68d7c1e0c91f863c6f2b8c9/examples/demo2.gif)
+//! ![Demo](https://raw.githubusercontent.com/ratatui-org/ratatui/b33c878808c4c40591d7a2d9f9d94d6fee95a96f/examples/demo2.gif)
 //!
 //! <div align="center">
 //!
@@ -300,8 +300,8 @@
 //! [Conventional Commits]: https://www.conventionalcommits.org
 //! [API Documentation]: https://docs.rs/ratatui
 //! [Changelog]: https://github.com/ratatui-org/ratatui/blob/main/CHANGELOG.md
-//! [Contributing]: https:://github.com/ratatui-org/ratatui/blob/main/CONTRIBUTING.md
-//! [Breaking Changes]: https:://github.com/ratatui-org/ratatui/blob/main/BREAKING-CHANGES.md
+//! [Contributing]: https://github.com/ratatui-org/ratatui/blob/main/CONTRIBUTING.md
+//! [Breaking Changes]: https://github.com/ratatui-org/ratatui/blob/main/BREAKING-CHANGES.md
 //! [docsrs-hello]: https://github.com/ratatui-org/ratatui/blob/c3c3c289b1eb8d562afb1931adb4dc719cd48490/examples/docsrs-hello.png?raw=true
 //! [docsrs-layout]: https://github.com/ratatui-org/ratatui/blob/c3c3c289b1eb8d562afb1931adb4dc719cd48490/examples/docsrs-layout.png?raw=true
 //! [docsrs-styling]: https://github.com/ratatui-org/ratatui/blob/c3c3c289b1eb8d562afb1931adb4dc719cd48490/examples/docsrs-styling.png?raw=true