Error boundary and 404 page added

[AlemTuzlak]

Fixes #

Description

Added a catch-all route as the 404 page
Added a root error boundary
Changed i18next backended to the more popular alternative

Type of change

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• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update
• Algorithm update - updates algorithm documentation/questions/answers etc.
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Reviewer checklist

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• Check if the UI is working as expected and is satisfactory
• Check if the code is well documented
• Check if the behavior is what is expected
• Check if the code is well tested
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[github-actions]

Coverage Report

Status	Category	Percentage	Covered / Total
🔵	Lines	98.34%	119 / 121
🔵	Statements	98.34%	119 / 121
🔵	Functions	66.66%	2 / 3
🔵	Branches	100%	3 / 3

File Coverage

No changed files found.

Generated in workflow #103 for commit 50d86e8 by the Vitest Coverage Report Action