update readme

Author: greggman

README.md

@@ -92,6 +92,17 @@ This way you don't have to go back and fix already translated articles. Just tra
 at a time and leave the links as is. They'll link to placeholders until someone translates the missing
 articles.
 
+**DO NOT CHANGE LINKS** : For example a link to a local resources might look like
+
+ [text](link)
+
+or
+
+ <img src="somelink">
+
+While you can add query parameters (see below) do not add "../" to try to make the link relative to the
+.md file. Links should stay as though the article exists at the same location as the original English.
+
 ### UI localization
 
 Some of the diagrams allow passing translations for the UI and other text.
@@ -136,12 +147,27 @@ Steps
 
 now open your browser to `http://localhost:8080`
 
+#### Build options
+
+This is mostly for debugging `build.js`. Since it takes a while to process all the files
+you can set `ARTICLE_FILTER` to a substring of the filenames to process. For example
+
+ ARTICLE_FILTER=rotation npm run build
+
+Will build the site as though only articles with `rotation` in their filename exist.
+
 ## TO DO
 
-A list of articles I'd like to write or see written
+* Make a continuous build
+
+ Right now the build processes all files at once. Part if this is because
+ it builds RSS feeds and checks for missing files. If those are separated
+ out then could make it continously build individual articles which would
+ be super useful.
+
+### A list of articles I'd like to write or see written
 
 * lighting
- * spot lighting
  * normal maps
  * shadow maps
 * geometry
@@ -156,7 +182,6 @@ A list of articles I'd like to write or see written
 * animation
  * blendshapes
  * hierarchical animation
- * skinning
 * debugging
  * debugging JS WebGL
  * example (https://goo.gl/8U5whT)
@@ -185,7 +210,6 @@ A list of articles I'd like to write or see written
 * text
  * glyph cache
 * post processing
- * how to render to a texture (scene on cube)
  * DOF
  * glow
  * light rays