docs: fix pipx install directions link

[budak7273]

Noticed this while reading, I didn't see any open issues for it

Summary by Sourcery

Documentation:

• Correct the pipx installation instructions link in the main documentation index page.

[sourcery-ai]

Reviewer's guide (collapsed on small PRs)

Reviewer's Guide

Updates the documentation link for pipx installation instructions to point to the current official URL.

File-Level Changes

Change	Details	Files
Update pipx installation documentation link to the new official URL.	Replace outdated pipx documentation URL with the new how-to/install-pipx URL in the installation docs section	docs/_index.md

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