Add release notes for v2025.07.1 (pydata#10520)

Release notes for v2025.07.0 (pydata#10495)

* move older release notes to current release

* remove empty section headers

* release summary

* add release date

* remove repeated contributor name

* Update doc/whats-new.rst

Co-authored-by: Deepak Cherian <dcherian@users.noreply.github.com>

* fix syntax of github profile link

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Co-authored-by: Deepak Cherian <dcherian@users.noreply.github.com>

Release 2025.06.1 (pydata#10416)

Release v2025.06.0 (pydata#10406)

Release notes for 2025.04.0 (pydata#10272)

release 2025.03.1 (pydata#10188)

Release 2025.03.0 (pydata#10143)

* Release 2025.03.0

* Update doc/whats-new.rst

Co-authored-by: Joe Hamman <jhamman1@gmail.com>

* one more

* cleanup

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Co-authored-by: Joe Hamman <jhamman1@gmail.com>

release notes: 2025.01.2 (pydata#10007)

* finalize release notes

* add contributors

* Tweak main what's new entry for time coding (#4)

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Co-authored-by: Spencer Clark <spencerkclark@gmail.com>

release notes: 2025.01.1 (pydata#9931)

Whats-new 2025.01.0 (pydata#9919)