Update docs and bump `hugo` version

[shenyih0ng]

To be merged after #572

Description

• Updated README.md with more detailed instructions on creating posts and updating event schedules
• Add emojis to headers (most of them are suggested by copilot)
• Update hugo version

Preview: https://github.com/nushackers/nushackers-site/tree/chore/update-docs

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[ravern]

Let's merge?