Only allow awesome table block in news pages

...h/public/funds/migrations/0011_add_awesome_table_block.py

opentech/public/news/blocks.py

...ch/public/news/migrations/0009_add_awesome_table_block.py

opentech/public/news/models.py

...ews/templates/news/blocks/awesome_table_widget_block.html

.../public/people/migrations/0013_add_awesome_table_block.py

...ublic/projects/migrations/0008_add_awesome_table_block.py

.../standardpages/migrations/0004_add_awesome_table_block.py

opentech/public/utils/blocks.py