Add the editable flag to the API and tweak the form to create better

opentech/apply/funds/api_views.py

opentech/apply/funds/serializers.py

...tatic_src/src/app/src/components/NoteListingItem/index.js

...ic_src/src/app/src/components/NoteListingItem/styles.scss

...h/static_src/src/app/src/components/RichTextForm/index.js

opentech/static_src/src/app/src/containers/AddNoteForm.js

...h/static_src/src/app/src/containers/DisplayPanel/index.js

opentech/static_src/src/app/src/containers/EditNoteForm.js

opentech/static_src/src/app/src/containers/Note.js

opentech/static_src/src/app/src/containers/NoteListing.js

opentech/static_src/src/app/src/redux/actions/notes.js

opentech/static_src/src/app/src/redux/reducers/notes.js

...tech/static_src/src/app/src/redux/reducers/submissions.js

opentech/static_src/src/app/src/redux/selectors/notes.js