Update README.md

Author: gregcaporaso

README.md

@@ -4,6 +4,8 @@ This is the source of the old QIIME 2 user documentation (primarily focused on t
 The rendered version of these docs can still be found at https://docs.qiime2.org/2024.10, but we recommend referring to the new docs as this content is outdated.
 
 For the new amplicon docs, see https://amplicon-docs.qiime2.org.
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 For the MOSHPIT (metagenome) docs, see https://moshpit.qiime2.org.
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 For other learning resources, see https://library.qiime2.org.