[cr] RFR: index.html: remove indentation

[Erik Helin]

Hi all,

please review this small pull request that removes the indentation from `index.html`. This is preparation for inlining `style.css` and `webrev.js` into `index.html` (to reduce the number of network requests). When `style.css` and `webrev.js` is inlined then it is easier to read `index.html` without indentation.

Thanks,
Erik

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Commit messages:
 - index.html: remove indentation

Changes: https://git.openjdk.java.net/cr/pull/11/files
 Webrev: https://webrevs.openjdk.java.net/?repo=cr&pr=11&range=00
  Stats: 11 lines in 1 file changed: 0 ins; 0 del; 11 mod
  Patch: https://git.openjdk.java.net/cr/pull/11.diff
  Fetch: git fetch https://git.openjdk.java.net/cr pull/11/head:pull/11

PR: https://git.openjdk.java.net/cr/pull/11