update header and index

Author: kylepjohnson

corpora.md

@@ -1,5 +1,5 @@
 ---
-title: Legacy Docs (v0.1.x)
+title: Docs
 redirect_to:
-  - https://legacy.cltk.org
+  - https://docs.cltk.org
 ---

docs.md

@@ -4,7 +4,27 @@ layout: default
 
 The Classical Language Toolkit (CLTK) is a Python library offering natural language processing (NLP) for the languages of pre–modern Eurasia. Pre-configured pipelines are available for 19 languages.
 
+- Install: `pip install "cltk[openai,stanza,ollama]"`
+- Code: <https://github.com/cltk/cltk>
+- Docs: <https://docs.cltk.org>
+
 ## Maintainers
 
 * [Kyle P. Johnson](https://github.com/kylepjohnson)
 * [Clément Besnier](https://github.com/clemsciences)
+
+# Previous version
+
+Previous generations of the CLTK are not supported anymore, but for those needing to use or reference past versions, these are preserved.
+
+## Version `1.x`
+
+- Install: `pip install cltk==1.5.0`
+- Code: <https://github.com/cltk/cltk/tree/v1>
+- Docs: <https://v1.cltk.org>
+
+## Version `0.x`
+
+- Install: `pip install cltk==0.1.121`
+- Code: <https://github.com/cltk/cltk/tree/v0>
+- Docs: <https://v0.cltk.org>