Router refactor

[elboletaire]

• Removed SaaS dedicated router files (and removed some of the unused ones, if not all)
• Split router into different router/routes files (root, process-create and dashboard)
• Ensure all routes using strings are now using the defined Routes object
• Fixed some links that were incorrectly using react-router-dom Link instead of a normal link
• Fixed logout redirecting too soon, making the page to render the login page instead

PS: You can ignore the branch name.. it was created with a totally different intention

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