Last call: Sage Release tour for version 10.3

[Matthias Koeppe]

https://github.com/sagemath/sage/wiki/Sage-10.3-Release-Tour

Please review and edit, or post a response here with corrections / suggestions 

• User interface: JupyterLab, Notebook 7, IPython 8.18
• Matroids
• Graph theory
• Geometry
• Generic groups and rings
• Number Theory
• Elliptic Curves
• New developer tools
• Sphinx role :issue: replaces :trac:
• Doctest failures are shown in the "Files changed" tab on PRs
• Full unicode support in the documentation
• Dev container configurations for all tested Linux platforms
• OS-dependent doctest tags
• New sage --package subcommands metrics, properties, dependencies
• Improvements to sage --package subcommands create and update
• Modularization tooling: sage --fixdistributions
• sage_setup.autogen.flint
• Customizing GH Actions workflows in forked repositories
• Package upgrades, configuration changes, porting
• Python 3.12
• FLINT 3
• Cython 3 transition
• Other package upgrades
• Build system changes
• Porting to the Pyodide (Web Assembly) platform
• Availability of Sage 10.3 and installation help
• Sources
• Known problems and workarounds
• Help
• More details