README: remove CI badges.

Author: stanislaw

README.md

@@ -1,8 +1,4 @@
 # StrictDoc
 
-![](https://github.com/stanislaw/strictdoc/actions/workflows/ci-mac.yml/badge.svg)
-![](https://github.com/stanislaw/strictdoc/actions/workflows/ci-linux-ubuntu-latest.yml/badge.svg)
-![](https://github.com/stanislaw/strictdoc/actions/workflows/ci-windows.yml/badge.svg)
-
 The documentation is hosted on Read the Docs:
 [StrictDoc documentation](https://strictdoc.readthedocs.io/en/stable/).