Remove .circleci folder

Seems like circleci link is dead. As the github action is good, there's no need to keep circleci. Remove.

Author: sumanstats

.circleci/config.yml

@@ -1,7 +1,6 @@
 .sass-cache/
 .git/
 .gitignore
-.travis.yml
 writing-docs
 build
 .github