Update docs font to match marshmallow; remove requirements from readme (#704)

Author: sloria

README.rst

@@ -135,8 +135,6 @@ Get it now
    $ pip install -U marshmallow-sqlalchemy
 
 
-Requires Python >= 3.9, marshmallow >= 3.18.0, and SQLAlchemy >= 1.4.40.
-
 .. end elevator-pitch
 
 Documentation

docs/conf.py

@@ -42,8 +42,7 @@
     "source_directory": "docs/",
     "sidebar_hide_name": True,
     "light_css_variables": {
-        # Serif system font stack: https://systemfontstack.com/
-        "font-stack": "Iowan Old Style, Apple Garamond, Baskerville, Times New Roman, Droid Serif, Times, Source Serif Pro, serif, Apple Color Emoji, Segoe UI Emoji, Segoe UI Symbol;",
+        "font-stack": "Charter, Iowan Old Style, Palatino Linotype, Palatino, Georgia, serif;",
     },
     "top_of_page_buttons": ["view"],
 }