Trackplot

What's Changed
* update the readme doc by zhou-ran in https://github.com/ygidtu/trackplot/pull/91
* fix several bugs by ygidtu in https://github.com/ygidtu/trackplot/pull/92


**Full Changelog**: https://github.com/ygidtu/trackplot/compare/v0.3.3...v0.3.4

**Full Changelog**: https://github.com/ygidtu/trackplot/compare/v0.3.2...v0.3.3

1. remove trackplotweb and merge into cmd tools
2. more flexible category check in igv mode, modify vmin and vmax validation in heatmap
3. fix bugs in web ui parameters

What's Changed
* update the doc of installation by zhou-ran in https://github.com/ygidtu/trackplot/pull/90


**Full Changelog**: https://github.com/ygidtu/trackplot/compare/v0.3.1...v0.3.2

Trackplot web: fastapi update to v0.100.0, caused unexpected 422 error, therefore migrate to flask to reduce requirements and increase stability. Better web help info and layout.
Trackplot cmd: fix layout issue while --show-site
add AppImage files for linux (x86_64) platform, reduce the difficulty of installation and use.
We provide the packed python wheel and tar.gz file, and the built trackplot and trackplot web server in AppImage format.