Site Template Setup Documentation

[joshdentremont]

Purpose / why

Adding extra information about setting up a site template site as described in #2302

What changes were made?

Added a new documentation page

Verification

• Check that the instructions make sense
• Check that the importing demo objects section works and gives you the correct demo objects

Interested Parties

• @Islandora/documentation
• @Islandora/committers

Checklist

Pull-request Reviewer

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?

Person Merging

The 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?

[rosiel]

I'll approve, but wait till @nigelgbanks gives the OK (it includes too much about production for me to be confident merging).

[nigelgbanks]

I'll approve, but wait till @nigelgbanks gives the OK (it includes too much about production for me to be confident merging).

Looks good to me!