chore: drop docs and related files (#168)

* chore: drop `docs` and related files

Signed-off-by: Yurii Serhiichuk <savik.ne@gmail.com>

* docs: update changelog

Signed-off-by: Yurii Serhiichuk <savik.ne@gmail.com>

Author: xSAVIKx

CHANGELOG.md

@@ -12,6 +12,9 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 ### Changed
 - Code quality and styling tooling is unified and configs compatibility is ensured ([#167])
 
+### Removed
+- `docs` folder and related unused tooling ([#168])
+
 ## [1.3.0] — 2022-09-07
 ### Added
 - Python 3.9 support ([#144])
@@ -147,3 +150,4 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 [#160]: https://github.com/cloudevents/sdk-python/pull/160
 [#165]: https://github.com/cloudevents/sdk-python/pull/165
 [#167]: https://github.com/cloudevents/sdk-python/pull/167
+[#168]: https://github.com/cloudevents/sdk-python/pull/168