RFR: Split up the monolithic index.md, take two [v2]

[Magnus Ihse Bursie]

On Thu, 12 May 2022 15:11:14 GMT, Jesper Wilhelmsson <jwilhelm at openjdk.org> wrote:

>> Magnus Ihse Bursie has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   If the TOC does not match reality, fail with a build error
>
> Makefile line 12:
> 
>> 10: LEGACY_MD := $(wildcard src/*.md)
>> 11: LEGACY_FOOTER := $(patsubst src/%.md, build/support/footers/%.html, $(LEGACY_MD))
>> 12: LEGACY_RESULT := $(patsubst src/%.md, build/dist/%.html, $(LEGACY_MD))
> 
> Why legacy?

I dunno. I needed to call it something. :-) If you explain to me the purpose of `codeReview.md`, `jckAcquisition.md`, 
`reviewBodies.md` and `webrevHelp.md`, I can give it a better name. My impression was that this was some old files that will be replaced by the guide in the fullness of time.

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PR: https://git.openjdk.java.net/guide/pull/82