Frontend refactor to Vue3

[Monirzadeh]

This Issue try to look at different aspect of shiori front end refactor. PR or any other help is Welcome

• load settings should be once in code instead of current multiple load
• all variables should be unified and function scope (instead of using var in current code)
• EventBus signaling is not supported with VUE3 and we should rewrite that.
• Find a solution for sending signal between tabs to not reload pages when settings change.
• Unit test for frontend page
• Use switch instead of if in several places of code for better performance
• Find solution to avoid flashing #561
• Make it easier for further update if we use VUE3 in long term.
• Support multi-language and make it possible to add translation.
• dose Vue3 best possible option? htmx or any other option can work better? the point is to be lightest ever fronted and avoid java script as much as possible
• if we use vue3 rewrite code to typescript give us any advantage?