Ansible no longer limited to v 2.8.

[alxp]

Related PR: Islandora-Devops/islandora-playbook#206

Github Issue; #1993
Github Issue: #1194

Purpose / why

The documentation currently specifies that an Ansible version must be no later than 2.8. The changes made in the install-profile branch fix compatibility with Ansible versions 2.9 and later.

What changes were made?

This change removes the wording and install directives that pin the Ansible version.

Verification

Check that the version string "2.8.7" no longer appears in the installation instructions for Ansible�.

Interested Parties

, @Islandora/8-x-committers_

---

Checklist

Pull-request reviewer should ensure the following

• Does this PR link to related issues?
• Does the proposed documentation align with the Islandora Documentation Style Guide?
• Are the changes accurate, useful, free of typos, etc?
• Does this PR update the last updated on date on the documentation page?

Person merging should ensure the following

• Does mkdocs still build successfully? (This is indicated by TravisCI passing. To test locally, and see warnings, see How To Build Documentation.)
• If pages are renamed or removed, have all internal links to those pages been fixed?
• If pages are added, have they been linked to or placed in the menu?
• Did the PR receive at least one approval from a committer, and all issues raised have been addressed?

[alxp]

Accidentally hit 'merge' button :P will revert if related install-profile PR is held up any longer.