feat: migrate to bun package manager

[ElenaBitire]

What does this do?

This PR migrates the project from using pnpm to bun package manager:

• migrate to bun
• update documentation to reflect the migration

Why did you do this?

Bun package manager offers several advantages like simplified dependency management, improved performance.

How did you test this?

• locally

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[github-actions]

💯 Test Coverage

Lines	Statements	Branches	Functions
	37.68% (182/483)	33.48% (73/218)	24.73% (46/186)

😎 Tests Results

Tests	Skipped	Failures	Errors	Time
40	0 💤	0 ❌	0 🔥	27.263s ⏱️

👀 Tests Details • (38%)

File	% Stmts	% Branch	% Funcs	% Lines	Uncovered Line #s
All files	37.68	33.48	24.73	38.77
app	0	0	0	0
_layout.tsx	0	0	0	0	22–75
ui	71.34	51.85	59.37	71.83
button.tsx	100	87.5	100	100	131–135
input.tsx	85.71	83.33	60	100	92, 113
text.tsx	100	40	100	100	15–42