Update README.md

Author: gregcaporaso

README.md

@@ -1,3 +1,9 @@
-# docs (user docs)
+# Source for "old docs"
+
+This is the source of the old QIIME 2 user documentation (primarily focused on the amplicon distribution).
+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can still be found at https://docs.qiime2.org/2024.10, but we recommend referring to the new docs as this content is outdated.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.
+For the MOSHPIT (metagenome) docs, see https://moshpit.qiime2.org.
+For other learning resources, see https://library.qiime2.org. 
 
-![](https://github.com/qiime2/docs/workflows/ci/badge.svg)