Enhancement/issue 881 favor content over configuration eg meta

[thescientist13]

Related Issue

resolves #881

Invalidates:

• <meta> Component package #304
• add support for configuring lang attribute in default template #558 (seems like it could be worthy of opening a discussion around i18n though?)
• title configuration should accept a (formatting) function as an option #655

Summary of Changes

1. title and meta configurations are no longer supported in greenwood.config.js
2. Updated docs and specs accordingly (as now many specs don't even need a config file! 🎉 )
3. Migrated www/ config to use <title> and <meta> tags in HTML with interpolateFrontmatter
4. Updated _Getting Started_guide accordingly

TODO

1. Move www/ meta and title out of greenwood.config.js and take advantage of interpolateFrontmatter for og meta tags
2. update greenwood-getting-started repo - Enhancment/issue 881 update for content over configuration greenwood-getting-started#59
3. update greenwood-template-blog repo (if needed) - Enhancement/issue 881 update for content over configuration greenwood-template-blog#3
4. Need to wait for ensure SPA does not prerender by default #891

Discussion

1. Issue title configuration should accept a (formatting) function as an option #655 could still be useful maybe?
2. Could ensure unique keys for <meta> / when lower page / template overrides parent page / template? - added as tracking to my personal backlog