update some additional files from upstream

Author: leviding

.gitattributes

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 * text=auto eol=lf
+*.svg       binary

AUTHORING.md

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+
+# Authoring
+
+This describes important stuff about authoring new articles of the tutorial.
+
+## Internal links
+
+All tutorial links should start from the root, not including the domain.
+
+✅ OK:
+
+```md
+We'll cover that in the chapter [about functions](/function-basics)
+```
+
+❌ Not ok:
+
+```md
+We'll cover that in the chapter [about functions](https://javascript.info/function-basics)
+```
+
+Also, to reference a chapter, there's a special "info:" scheme, like this:
+
+```md
+We'll cover that in the chapter <info:function-basics>.
+```
+
+Becomes:
+```html
+We'll cover that in the chapter <a href="/function-basics">Function basics</a>.
+```
+
+The title is auto-inserted from the referenced article. That has the benefit of keeping the right title if the article gets renamed.
+
+## TODO
+
+Ask @iliakan to for more details.

contributors.md

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+
+# CSS for JS developers
+
+- Outline

css.md

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+
+- Drag events
+- History api
+- Pointer events
+- Touch events
+- Canvas (2d graphics)
+- Security (xsrf xss csp etc)