[TECH DEBT] Move islandora_text_extraction_defaults into the Islandora Starter Site

[rosiel]

Overview of Tech Debt

Islandora Text Extraction Defaults is a config-rich Feature module that is bundled with Islandora. It is meant to be installed to add a functioning "default" out of the box to demonstrate Islandora Text Extraction. In all the other cases (audio, video, etc) this need was solved by putting configuration in Islandora Defaults (now the Islandora Starter Site).

The submodule islanodra_text_extraction_defaults should be removed from Islandora, and its config (if not already there) moved into the Starter Site.