docs: update installation doc to improve compatibility

[this-is-tobi]

Description

This PR update the installation page in the documentation to include some vars to the argocd-vault-plugin download. This improve compatibility for Darwin and ARM64 as the command compute the url to download the appropriate binary.

It also updates the AVP_PLUGIN version to 1.17.0 in the installation documentation.

Fixes: <! -- link to issue -->

Checklist

Please make sure that your PR fulfills the following requirements:

• Reviewed the guidelines for contributing to this repository
• The commit message follows the Conventional Commits Guidelines.
• Tests for the changes have been updated
• Are you adding dependencies? If so, please run go mod tidy -compat=1.21 to ensure only the minimum is pulled in.
• Docs have been added / updated
• Optional. My organization is added to USERS.md.

Type of Change

• Bugfix
• Feature
• Code style update (formatting, local variables)
• Refactoring (no functional changes, no api changes)
• New tests
• Build/CI related changes
• Documentation content changes
• Other (please describe)

Other information

[jacksgt]

Hi, I think this is a good contribution. Could somebody merge it please?

[this-is-tobi]

@werne2j @jkayani Is there something wrong for you ? Maybe you prefer just to declare arch as argument like AVP_PLUGIN ?