Fix Banners and Layout
Fix Plot symbols table
Add TOC to introduction to plotting (test TOC).
Add TOC to all posts (TOC still needs to stay at top of page)
Fix Headers and TOCs that were missing or not needed
Migrate Statistical Distributions table to new format
Add todo lists to readme
Add What is data science post and new data sciecne category.
Add Introduction message to the landing page
remove last posts part from landing page