Added support for footnotes

docs/extensions/admonition.md

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+# Admonition
+
+## Variations
+
+!!! hint
+
+!!! hint "Failure with custom name"
+
+!!! hint
+    Lorem ipsum dolor sit amet, consectetur adipiscing elit. Sed at nisl ac
+    urna lobortis consectetur ut vitae urna. Donec eu viverra sapien. Nam
+    tempor auctor lacus et congue. Quisque id congue velit. Lorem ipsum dolor
+    sit amet, consectetur adipiscing elit.
+
+    Nunc eu odio eleifend, blandit leo a, volutpat sapien. Phasellus posuere in
+    sem ut cursus. Nullam sit amet tincidunt ipsum, sit amet elementum turpis.
+    Etiam ipsum quam, mattis in purus vitae, lacinia fermentum enim.
+
+!!! hint ""
+    Lorem ipsum dolor sit amet, consectetur adipiscing elit. Sed at nisl ac
+    urna lobortis consectetur ut vitae urna. Donec eu viverra sapien. Nam
+    tempor auctor lacus et congue. Quisque id congue velit. Lorem ipsum dolor
+    sit amet, consectetur adipiscing elit.
+
+!!! hint
+    Lorem ipsum dolor sit amet, consectetur adipiscing elit. Sed at nisl ac
+    urna lobortis consectetur ut vitae urna. Donec eu viverra sapien. Nam
+    tempor auctor lacus et congue. Quisque id congue velit. Lorem ipsum dolor
+    sit amet, consectetur adipiscing elit.
+
+    > Nunc eu odio eleifend, blandit leo a, volutpat sapien. Phasellus posuere
+    > sem ut cursus. Nullam sit amet tincidunt ipsum, sit amet elementum turpis.
+
+    Nunc eu odio eleifend, blandit leo a, volutpat sapien. Phasellus posuere in
+    sem ut cursus. Nullam sit amet tincidunt ipsum, sit amet elementum turpis.
+    Etiam ipsum quam, mattis in purus vitae, lacinia fermentum enim.
+
+TODO: NESTED...
+
+## Specimen
+
+!!! hint "hint, note <small>default</small>"
+
+!!! tip "tip, idea"
+
+!!! success "success, check, done"
+
+!!! warning "warning, warn"
+
+!!! failure "failure, fail, missing"
+
+!!! fatal "danger, fatal"
+
+!!! bug "error, bug"

docs/extensions/footnotes.md

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+# Footnotes
+
+Lorem ipsum dolor sit amet, consectetur adipiscing elit. Sed at nisl ac
+urna lobortis consectetur ut vitae urna. Donec eu viverra sapien. Nam
+tempor auctor lacus et congue. Quisque id congue velit. Lorem ipsum dolor
+sit amet, consectetur adipiscing elit.
+
+#### Headline on fourth level
+
+Footnotes[^1] have a label[^@#$%] and the footnote's content.
+
+### 2nd Headline on fourth level
+
+[^1]: Lorem ipsum dolor sit amet, consectetur adipiscing elit. Sed at nisl ac
+      urna lobortis consectetur ut vitae urna. Donec eu viverra sapien. Nam
+      tempor auctor lacus et congue. Quisque id congue velit. Lorem ipsum dolor
+      sit amet, consectetur adipiscing elit.
+
+[^@#$%]: Lorem ipsum dolor sit amet, consectetur adipiscing elit. Sed at nisl ac
+      urna lobortis consectetur ut vitae urna. Donec eu viverra sapien. Nam
+      tempor auctor lacus et congue. Quisque id congue velit. Lorem ipsum dolor
+      sit amet, consectetur adipiscing elit.
+[^2]: Lorem ipsum dolor sit [amet](#), consectetur adipiscing elit. Sed at nisl ac
+      urna lobortis consectetur ut vitae urna. **Donec** eu viverra sapien. Nam
+      tempor auctor lacus et congue. Quisque id congue velit. Lorem ipsum dolor
+      sit amet, consectetur adipiscing elit.
+
+Nunc eu odio eleifend, blandit leo a, volutpat sapien. Phasellus posuere in
+sem ut cursus. Nullam sit amet tincidunt ipsum, sit amet elementum turpis.
+Etiam ipsum quam, mattis in purus vitae, lacinia fermentum enim.
+
+## [Some headline <small>with</small> a link](http://www.google.de)
+
+Lorem ipsum dolor sit amet, consectetur adipiscing elit. Sed at nisl ac
+urna lobortis consectetur ut vitae urna. Donec eu viverra sapien. Nam
+tempor auctor lacus et congue. Quisque id congue velit. Lorem ipsum dolor
+sit amet, consectetur adipiscing elit.
+
+Nunc eu odio eleifend, blandit leo a, volutpat sapien. Phasellus posuere in
+sem ut cursus. Nullam sit amet tincidunt ipsum, sit amet elementum turpis.
+Etiam ipsum quam, mattis in purus vitae, lacinia fermentum enim.
+
+Lorem ipsum dolor sit amet, consectetur adipiscing elit. Sed at nisl ac
+urna lobortis consectetur ut vitae urna. Donec eu viverra sapien. Nam
+tempor auctor lacus et congue. Quisque id congue velit. Lorem ipsum dolor
+sit amet, consectetur adipiscing elit.