index.html: orrected link to RDA adoption grantHEADmaster

Until now, the top page linked to the original RDA adoption grant blog
post. However, RDA has recently updated their webpage architecture,
and the old URLs have been moved to an 'archive.rd-alliance.org/'
prefix.

With this commit, the archival URL of the blog post is used to fix the
problem.

This problem was discovered by Stergios Amarantidis.

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