opengraph images

[deansallinen]

This PR:

• add support for multiple layouts
• include token-based authentication for image generator service
• add test page for opengraph images at /debug/opengraph
• add basic index page for the various debug pages

The opengraph image needs to be accessible from a url like http://unicove.com/en/eos/og_default.png in the head of the document, but we also need some way of changing the image parameters e.g. title, text, layout, language, etc.

There were two approaches I considered to include all the various options we needed for generation:

1. add them to the image url like http://unicove.com/en/eos/layout-1/Title%20of%20the%20image/Text%20of%20image/og_default.png or http://unicove.com/en/eos/og_default.png?text=Text%20of%20image&layout=1

Upside to this approach is all configuration could happen at the +page.ts load function of the particular route.

But using params like this would open the api to potential abuse and create massive urls. Even with a token-based authentication between unicove.com and the image-generator service, anyone could just change the query params and unicove would generate a valid image

2. map image routes to their image generator properties

example: http://unicove.com/en/eos/send uses the image at http://unicove.com/en/eos/api/og/send.png which uses the predefined options for that route (text, title, layout, language, network, etc.)

The upside is no invalid images can be generated, but the tradeoff is all configuration needs to be done in a centralized place (in this case, the object at the api endpoint)

Note: two new env variables are needed

API_OPENGRAPH_GENERATOR is the url of the endpoint for the image generator
API_OPENGRAPH_TOKEN is the shared token that matches the endpoint

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