feat(client): add guide to press Esc for closing the overlay

[chaejunlee]

Description

Follow up of the PR #13795.

The feature for closing the vite-error-overlay with Esc key has been added.

However, the overlay doesn't say it can be closed with Esc key.

Therefore, I added little guide to let users know about this feature.

Additional context

Below is how it looks

---

What is the purpose of this pull request?

• Bug fix
• New Feature
• Documentation update
• Other

Before submitting the PR, please make sure you do the following

• Read the Contributing Guidelines.
• Read the Pull Request Guidelines and follow the PR Title Convention.
• Check that there isn't already a PR that solves the problem the same way to avoid creating a duplicate.
• Provide a description in this PR that addresses what the PR is solving, or reference the issue that it solves (e.g. fixes #123).
• Ideally, include relevant tests that fail without this PR but pass with it.

[stackblitz]

Run & review this pull request in StackBlitz Codeflow.

[chaejunlee]

1. Dark

• color: rgb(166, 167, 171);
• background-color: rgb(38, 40, 44);
• border-color: rgb(54, 57, 64);

2. Darker

• color: rgb(137 138 144);
• background-color: rgb(19 19 22);
• border-color: rgb(51 54 61);

What do you prefer? They look almost identical though 😄.

[chaejunlee]

I have one last thing to confirm from the maintainers.

Should I oxford comma it? Also very minute, but I want to check before it is merged!

1. Click outside, press Esc key or fix the code to dismiss. (AS-IS)
2. Click outside, press Esc key, or fix the code to dismiss. (Oxford Comma)

[bluwy]

Thanks! I quite like the first one. The background stands out just enough that it's shown as a keyboard key. Re comma, I usually use Oxford commas 😄 We also have a lot of usages that way in the codebase so I think we can use that too.