Invenio-communities

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- search: add query parser mappings and allowed terms list
- assets: change import components from invenio-vocabularies and react-invenio-forms

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- improve UX of community deletion modal

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- add custom fields of community to display on about page
- allow blank curation policy page and about page
- add extra filter to community service

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- refactor requests components

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- deny deletion of a community if there are open requests
- add ghost community when the community cannot be resolved

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- upgrade community settings layout
- split pages configuration
- reorganise community details submenu
- reorder details fields
- rename service component configuration variable
- add configurable error handler