Fix my mistakes

.readthedocs.yml

@@ -1,14 +1,17 @@
 version: 2
 
 build:
+  apt_packages:
+    - graphviz
   os: ubuntu-22.04
   tools:
     python: "3.10"
   jobs:
+
     post_checkout:
       - git fetch --unshallow || true
     pre_install:
-      - git update-index --assume-unchanged .rtd-environment.yml docs/conf.py
+      - git update-index --assume-unchanged docs/conf.py
 
 sphinx:
   builder: html

README.rst

@@ -1,5 +1,5 @@
 An interactive animation framework for matplotlib
-------------------------------------------------
+-------------------------------------------------
 
 This is for creating interactive animations with matplotlib.
 It is designed to handle N-dimensional data, and can be used to create animations.

setup.cfg

@@ -7,6 +7,7 @@ license_file = LICENSE.rst
 url = https://sunpy.org
 description = An interactive animation framework for matplotlib
 long_description = file: README.rst
+long_description_content_type = text/x-rst
 
 [options]
 zip_safe = False