Resolve "Create pages documentation"

.gitignore

.gitlab-ci.yml

.gitmodules

eraser-base/build.gradle

...e/src/test/java/de/tudresden/inf/st/eraser/RulesTest.java

pages/.gitignore

pages/custom_theme/footer.html

pages/docs/DSL.md

pages/docs/Inner-workings.md

pages/docs/Learner.md

pages/docs/MachineLearning.md

pages/docs/Model-description.md

pages/docs/config.md

pages/docs/contributing.md

pages/docs/img/config-eraser-binding.png

pages/docs/img/config-mqtt-binding.png

pages/docs/img/item-history.png

pages/docs/img/item-history.uxf

pages/docs/img/rules-object.png

pages/docs/img/rules-object.uxf