Migrate to mkdocs. (#325)

* Install mkdocs.

Uninstall Lektor.

* Migrate content to the mkdocs.

* Remove Lektor project.

* Migrate to Python 3.8.

* Setup remarklint.

* Setup pre-commit.

* Setup prettier.

* Setup yamllint hook.

* Setup yamllint.

* Remove unused metadata.

* Setup vale tool.

* Setup invoke tool.

* Setup Google Analytics.

* Correct eslint config according to the prettier tool.

* Correct stylelint config according to the prettier tool.

* Setup black and flake8 pre-commit hooks.

* Merge slides and root webpack projects.

* Setup doctest.

* Fix doctests.

* Setup Azure Pipeline.

* Add empty CSS file to run linter.

* Correct azure pipeline name.

* Add poetry to PATH.

* Ignore pycache directory.

* Split too long line in shell script.

* Add deploy invoke task.

* Correct bash script syntax written in the Yaml file.

* Custom domain support.

Author: proofit404

.eslintrc.js

@@ -1,13 +1,11 @@
 module.exports = {
-  extends: 'airbnb-base',
+  extends: "prettier",
   env: {
     browser: true
   },
-  parser: 'babel-eslint',
-  plugins: [
-    'babel',
-  ],
+  parser: "babel-eslint",
+  plugins: ["babel"],
   rules: {
-    'babel/semi': 1,
-  },
+    "babel/semi": 1
+  }
 };

.flake8

@@ -0,0 +1,2 @@
+[flake8]
+max-line-length = 88