User: add argument/counterargument

[Andrei0872]

Argument:

• content
• for or against

After creating an argument, show a toaster which will let the user know that.

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• WYSIWYG editor
• collect argument data on submit
• specify whether the argument is a counterargument for another argument(could be done at the top of the page and the user will be able to choose which argument the current argument is a counterargument for)
• endpoint for creating an argument
• an argument should have an option Add counterargument; when that is chosen, the user should be redirected to the create argument page, where the counterargument should be already shown
• (server): check if the argument's insertion was successful on a debate that does not exist(might need to check the affected rows count)
• modify argument card such that the title is actually part of the body and, upon expansion, load the entire serialized editor state
• delete the external_reference table
• protect client route: only auth user
• new-argument: check serialization & deserialization
• redirect to debates if /new-argument does not have crtDebate populated
• include debate's title when creating arg
• handle the case where there are no args in a debate
• display content when accordion expanded
• endpoint for fetching an argument
• create argument from UI
• show a toaster that will let the user know how the action went
• form types