Issue resolved, theme problem on time-complexity-analyzer page #18

[Hustler004]

I tweaked the implementation of theme-related buttons, used toggle functionality, changed function name so that they sound more intuitive, also the issue was solved by changing "window.onload = initializeComplexityChart();" command in analyzer.js file to "document.addEventListener("DOMContentLoaded", function () {
// Your analyser.js logic goes here
initializeComplexityChart();
});"
Let me know if the issue still resides!

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[multiverseweb]

@Hustler004 looks good to me. But I think the color of the chart is not changing to black in light mode. As the issue of code refiner theme button is fixed in this PR, I'm merging it.