Markdown-up

- [631bcc2](https://github.com/craigahobbs/markdown-up-py/commit/631bcc2) - update readme

- [a94ea02](https://github.com/craigahobbs/markdown-up-py/commit/a94ea02) - add .smd \(Schema Markdown\) extension

- [29dd452](https://github.com/craigahobbs/markdown-up-py/commit/29dd452) - update markdown-up app stub

- [94abe35](https://github.com/craigahobbs/markdown-up-py/commit/94abe35) - add python 3.11 support, remove python 3.6

- [73e241e](https://github.com/craigahobbs/markdown-up-py/commit/73e241e) - add mds extension

- [8edd71e](https://github.com/craigahobbs/markdown-up-py/commit/8edd71e) - use absolute markdown-up url paths

- [c01ac89](https://github.com/craigahobbs/markdown-up-py/commit/c01ac89) - update markdown-up web application stub