Replaces Highcharts with Chart.js

Walkthrough

The project transitioned from using the Highcharts library to Chart.js for chart rendering. This change involved removing Highcharts from the dependency list, updating JavaScript asset dependencies, and modifying initialization scripts to accommodate Chart.js, aiming to improve maintainability, performance, and reduce potential licensing costs.

Changes

Files	Change Summary
Gemfile	Removed `highcharts-rails` gem
app/assets/javascripts/.../application.assets.js	Replaced `highcharts` with `Chart.bundle`
app/assets/javascripts/manage/application.js	Replaced `setupHighcharts` with `setupChartJs`
app/assets/javascripts/manage/lib/setupChartJs.js	Renamed function to `setupChartJs` from `setupHighcharts`

Related issues

codeRIT/hackathon-manager#1002: This PR directly addresses the key objectives outlined in the issue by replacing Highcharts with Chart.js, ensuring seamless transition and updating documentation and codebase as required for Chart.js integration.

🐇✨
In the realm of code, where charts do play,
A switch was made, Chart.js leads the way.
Out with the old, in with the new,
Smooth transitions, our aim is true.
Celebrate we shall, for the change is done,
A hop, a skip, under the coding sun.
🌟📊

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codeRIT / hackathon-manager