* Add Sections and MO(layer)/TG(layer) Example
Major changes:
1. Added sub-section headings to the portion before the examples.
2. Added a new Example 6, that allows MO(layer) and TG(layer) functionality to be embedded within tap dance functions.
Minor Changes:
1. Edited some text to better fit with new sub-headings.
* Update feature_tap_dance.md
* Update feature_tap_dance.md
