add previous versions page (#10)

Author: jordan-smith721

snooty.toml

@@ -14,4 +14,5 @@ driver-long = "MongoDB PyMongoArrow"
 version-number = "1.3"
 version = "v{+version-number+}"
 patch-version-number = "{+version-number+}.0"
+legacy-documentation = "https://mongo-arrow.readthedocs.io/en"
 api-root = "https://mongo-arrow.readthedocs.io/en/{+patch-version-number+}/api/index.html"

source/index.txt

@@ -13,6 +13,7 @@
 
 .. toctree::
 
+   /previous-versions
    /installation
    /quick-start
    /whats-new

source/previous-versions.txt

@@ -0,0 +1,22 @@
+.. _pymongo-arrow-previous-versions:
+
+=================
+Previous Versions
+=================
+
+.. facet::
+   :name: genre
+   :values: reference
+ 
+.. meta::
+   :keywords: old, backwards, downgrade, upgrade
+
+The following links direct you to documentation for previous versions of {+driver-short+}.
+
+- `Version 1.2 <{+legacy-documentation+}/1.2.0/>`__
+- `Version 1.1 <{+legacy-documentation+}/1.1.0/>`__
+- `Version 1.0 <{+legacy-documentation+}/1.0.0/>`__
+- `Version 0.7 <{+legacy-documentation+}/0.7.0/>`__
+- `Version 0.6 <{+legacy-documentation+}/0.6.0/>`__
+- `Version 0.5 <{+legacy-documentation+}/0.5.0/>`__
+- `Version 0.4 <{+legacy-documentation+}/0.4.0/>`__