This reverts commit 5b2255e903.
The feature about saving image as new file with different format is not the goal of an image viewer.
There is no need to keep feature diversity in this fork.
So I simply remove it.
- update README to notice the development of SarasaCW Picture.
- temporarily remove the most of old README by HTML comment syntax. these contents will be restored and fixed once I finish refactoring.
- Fix incorrect syntax of COPY which cause we fail to copy LICENSE in final distribution package.
- Add workflow_dispatch condition in workflow files to allow manual trigger.
yyc12345
