[amber-docs] RFR: Updated index for JDK 18 work in progress [v2]

[Gavin Bierman]

> Updating the index page

Gavin Bierman has updated the pull request incrementally with one additional commit since the last revision:

  Updating http to https

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Changes:
  - all: https://git.openjdk.java.net/amber-docs/pull/11/files
  - new: https://git.openjdk.java.net/amber-docs/pull/11/files/f3a63627..0506a9b9

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=amber-docs&pr=11&range=01
 - incr: https://webrevs.openjdk.java.net/?repo=amber-docs&pr=11&range=00-01

  Stats: 22 lines in 1 file changed: 0 ins; 0 del; 22 mod
  Patch: https://git.openjdk.java.net/amber-docs/pull/11.diff
  Fetch: git fetch https://git.openjdk.java.net/amber-docs pull/11/head:pull/11

PR: https://git.openjdk.java.net/amber-docs/pull/11