* add frontend search support for GHAE version
* add support for GHAE version to Algolia sync
* add browser tests for frontend search
* if a version can be derived from a path, but it is not a real version (like from a path that 404s), fall back to dotcom
* Update javascripts/search.js
* Update lib/algolia/sync.js
* remove FEATURE_NEW_VERSIONS from feature-flags.json
* remove process.env.FEATURE_NEW_VERSIONS from include files
* remove process.env.FEATURE_NEW_VERSIONS from lib files
* remove process.env.FEATURE_NEW_VERSIONS from middleware files
* remove process.env.FEATURE_NEW_VERSIONS from script files
* remove process.env.FEATURE_NEW_VERSIONS from test files
* update test fixtures to use new versions as canonical fixtures