Merge this with silverstripe/silverstripe-algolia

[unclecheese]

As a Silverstripe CMS developer, I want to be able to make a clear and easy decision about a search-as-a-service integration module for my website so that I can save time when planning projects.

Acceptance criteria

• Engage Will Rossiter for a code review and approval of overall approach
• Write Algolia implementation
• Have Will Rossiter review for feature parity
• Decide on a canonical name
• Ensure write permissions cover both parties
• Deprecate and redirect one module

[wilr]

/ping @matt-in-a-hat who has been the WIP Algolia module guinea pig.. FYI

[unclecheese]

Wow, you're quick. I didn't even tag you. 😮

[wilr]

For whatever reason Github thinks the default is for Team members is to watch new repos. You've been spamming me :)