chore: Update .gitignore, roadmap, and remove migration plan #177

Job	Run time
Build cuda wheel on windows-latest	6m 51s
Build cuda wheel on ubuntu-latest	2m 31s
Build cpu wheel on windows-latest	3m 21s
Build cpu wheel on macos-latest	57s
Build cpu wheel on ubuntu-latest	1m 39s
Test cpu wheel on macos-latest with Python 3.13	18s
Test cpu wheel on ubuntu-latest with Python 3.9	23s
Test cpu wheel on macos-latest with Python 3.9	51s
Test cpu wheel on ubuntu-latest with Python 3.13	20s
Test cuda wheel on windows-latest with Python 3.9	10m 36s
Test cpu wheel on windows-latest with Python 3.13	1m 2s
Test cuda wheel on ubuntu-latest with Python 3.13	35s
Test cuda wheel on ubuntu-latest with Python 3.9	39s
Test cuda wheel on windows-latest with Python 3.13	9m 34s
Test cpu wheel on windows-latest with Python 3.9	1m 23s
	41m 0s

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