docs: Fix "No module named 'imghdr'" when building website

Between Mitogen 0.3.19 & 0.3.20 Netlify changed their default Python to 3.13. This broke our deployment of https://mitogen.networkgenomics.com/. The previous default was Python 3.8, based on a recent successful build of https://spiffy-croissant-696d93.netlify.app.
mitogen-hq · Jan 7, 2025 · 882dc0c · 882dc0c
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diff --git a/docs/changelog.rst b/docs/changelog.rst
@@ -21,6 +21,8 @@ To avail of fixes in an unreleased version, please download a ZIP file
 In progress (unreleased)
 ------------------------
 
+* :gh:issue:`1209` docs: Fix Netlify build of website
+
 
 v0.3.20 (2025-01-07)
 --------------------

diff --git a/docs/netlify.toml b/docs/netlify.toml
@@ -0,0 +1,2 @@
+[build.environment]
+PYTHON_VERSION = "3.8"
-Original file line number
+Diff line change
@@ Expand Up @@
     In progress (unreleased)
     ------------------------
+    * :gh:issue:`1209` docs: Fix Netlify build of website
     v0.3.20 (2025-01-07)
     --------------------
@@ Expand Down @@