docs(api/index): fix strange uses of the word namespace
chore(docs): update to dgeni-0.4.0

* update package with new services and computeId config
* generateIndexPagesProcessor was not using log
* use StringMap not ES6-shim Map in errorNamespaceMap
* remove unused dependencies from generateErrorDocsProcessor
* ensure generatePagesDataProcessor adds its doc to the collection
* debugDumpProcessor was moved to dgeni-packages
test(docs): improve docs e2e tests