[Rev 01] RFR: Introducing markdown

[Jesper Wilhelmsson]

> Fixed a few bugs from html to markdown conversion.

Jesper Wilhelmsson has updated the pull request with a new target base due to a merge or a rebase. The incremental
webrev excludes the unrelated changes brought in by the merge/rebase. The pull request contains six additional commits
since the last revision:

 - Merge remote-tracking branch 'upstream/master' into introducing_markdown
 - Fixed page title and minor bugs from html to markdown conversion.
 - Converted all html files to markdown
 - Moved files to src directory
 - Changed mode on image.
 - Populating the repo with the old html guide files.

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Changes:
  - all: https://git.openjdk.java.net/guide/pull/4/files
  - new: https://git.openjdk.java.net/guide/pull/4/files/d116159b..72ca8428

Webrevs:
 - full: https://webrevs.openjdk.java.net/guide/4/webrev.01
 - incr: https://webrevs.openjdk.java.net/guide/4/webrev.00-01

  Stats: 0 lines in 0 files changed: 0 ins; 0 del; 0 mod
  Patch: https://git.openjdk.java.net/guide/pull/4.diff
  Fetch: git fetch https://git.openjdk.java.net/guide pull/4/head:pull/4

PR: https://git.openjdk.java.net/guide/pull/4