feat: restructure docs into "chapters" (#12)

* feat(docker, k8s): create containers folder and kubernetes notes

docs/languages/markdown.md

@@ -0,0 +1,79 @@
+# Markdown Notes
+
+## Headings
+
+```markdown
+Heading 1
+=========
+
+Heading 2
+---------
+
+# Heading 1
+## Heading 2
+### Heading 3
+```
+
+## Text Formatting
+
+```markdown
+*Italic*    _Italic_
+**Bold**    __Bold__
+
+~GitHub's strike-trough~
+```
+
+## Links & Images
+
+```markdown
+[link text](http://b.org "title")
+
+[link text][anchor]
+[anchor]: http://b.org "title"
+
+![alt attribute](http://url/b.jpg "title")
+
+![alt attribute][anchor]
+[anchor]: http://url/b.jpg "title"
+```
+
+```markdown
+> Blockquote
+
+* unordered list        - unordered list
+* unordered list        - unordered list
+* unordered list        - unordered list
+
+1) ordered list         1. ordered list
+2) ordered list         2. ordered list
+3) ordered list         3. ordered list
+
+- [ ] empty checkbox
+- [x] checked checkbox
+```
+
+### Horizontal rule
+
+```markdown
+---                     ***
+```
+
+## Code
+
+```markdown
+`inline code`
+
+    ```lang
+    multi-line
+    code block
+    ```
+```
+
+## Table
+
+```markdown
+| column label | column label | column label  |
+|:-------------|:------------:|--------------:|
+| left-aligned | centered     | right-aligned |
+| row contents | row contents | row contents  |
+```