Update installing-from-source.rst

[mindflowgo]

Adjusting the paths for venv, zsh was wrong, I'm assuming other 2 require similar changes.

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:rocket:	This description was created by Ellipsis for commit a4b5f1646048c5ca3d4a1f6d1351642e217ac942

Summary:

Updated virtual environment activation paths in src/installing-from-source.rst to use the home directory instead of the current directory.

Key points:

• Updated src/installing-from-source.rst to change virtual environment activation paths.
• For bash/zsh users, changed source ./venv/bin/activate to source ~/.venv/bin/activate.
• For Windows git bash users, changed source ./venv/Scripts/activate to source ~/.venv/Scripts/activate.
• For fish users, changed source ./venv/bin/activate.fish to source ~/.venv/bin/activate.fish.

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