Updated TODO

TODO.md

@@ -80,6 +80,7 @@
  - Engine flares shouldn't be centered
  - Sprite optimization: do we need to allocate a new `Vec` every frame? Probably not.
  - Better error when run outside of directory
+ - Documentation site & front page
 
 ## Content
  - Angled engines
@@ -117,7 +118,7 @@
  - Nova dust parallax
  - Ship outlines in radar
  - Engine flare ease in/out
-
+ - Lens flare
 
 ## Write and Document
  - Parallax
@@ -132,6 +133,7 @@
    - Ship AI
    - Handles
  - Content specification and pipeline
+ - How packer and optimizations work, and why
 
 
 ## Ideas