consider sxr

[xuwei-k]

• remove sxr links?
• replace scaladoc links?
• replace github source code link?
• restore sxr?
• use metadoc? https://github.com/scalameta/metadoc
• any others?

$ git grep "/sxr/"
src/dormant/Settings.md:[Keys](../sxr/sbt/Keys.scala.html). *update* is of type
src/nanoc/content/documentation.md:([source](<%= @config[:sbtVersionForScalaDoc] %>/sxr/index.html))
src/nanoc/content/documentation.md:- [sbt API](0.13.15/api/index.html) ([source](0.13.15/sxr/index.html))
src/reference/00-Getting-Started/08-Library-Dependencies.md:[Configuration](../sxr/sbt/Configuration.scala.html#sbt.Configuration) val:
src/reference/00-Getting-Started/11-Custom-Settings.md:[Defaults](../sxr/sbt/Defaults.scala.html).
src/reference/02-DetailTopics/01-Using-sbt/06-Scripts.md:class is [IvyConsole](../sxr/sbt/IvyConsole.scala.html).
src/reference/02-DetailTopics/04-Tasks-and-Commands/03-Commands.md:See [Command.scala](../sxr/sbt/Command.scala.html) for the source
src/reference/02-DetailTopics/04-Tasks-and-Commands/05-Build-State.md:[Structure.scala](../sxr/sbt/Structure.scala.html) for where `in`
src/reference/05-Faq/00.md:[hyperlinked sources](../sxr/).
src/reference/90-Developers-Guide/10-DevGuide-Notes/02-Settings-Core.md:[main/Structure.scala](../sxr/sbt/Structure.scala) for details.
src/reference/90-Developers-Guide/10-DevGuide-Notes/03-Setting-Initialization.md:[Load.scala](../sxr/sbt/Load.scala.html) file. It is approximately
src/reference/_sphinx/exts/key.py:        rellink = '../sxr/sbt/Keys.scala.html#sbt.Keys.%s' % node.keyName
src/reference/ja/00-Getting-Started/08-Library-Dependencies.md:もしくは、以下のようになる。このときの `configuration` は文字列もしくは [Configuration](../../sxr/sbt/Configuration.scala.html#sbt.Configuration) の値だ。
src/reference/ja/00-Getting-Started/11-Custom-Settings.md:  [Defaults]: ../../sxr/sbt/Defaults.scala.html
src/reference/zh-cn/00-Getting-Started/08-Library-Dependencies.md:或者像这样， 用字符串或者 [Configuration](../../sxr/sbt/Configuration.scala.html#sbt.Configuration) val 当做 `configuration`：
src/reference/zh-cn/00-Getting-Started/11-Custom-Settings.md:[这里](../../api/sbt/Keys\$.html)介绍了如何定义键。大多数的默认键定义在[这里](../../sxr/sbt/Defaults.scala.html)。

[dwijnand]

I'm happy with any of those options, tbh...