spelling: Dec blog post

Updates the blurb to be different from last month's

blog: Adds our October blog post

Merge pull request supabase#224 from duncanhealy/feature/todo-sql-policy

feature/todo sql policy

Merge pull request supabase#182 from supabase/blog_august

Adds august blog post

Merge branch 'master' of github.com:supabase/supabase

fix: adds missing sponsors link