Update INSTALL.md for modern Python/Django setup#118

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qzMalekuz wants to merge 2 commits intocytoscape:masterfrom

qzMalekuz:update-install-docs

Commits on Feb 28, 2026

Update INSTALL.md for Python 3 and Django 4.2 setup
qzMalekuz
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Commits on Mar 4, 2026

Add dependency installation and test instructions to INSTALL.md
qzMalekuz
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