docs: Rename FastExcel to FesodSheet on the website

[delei]

Purpose of the pull request

Releated #651

What's changed?

• Modify the sidebar menu
• Rename FastExcel to FesodSheet
• Optimize the descriptions of Excel terms

Checklist

• I have read the Contributor Guide.
• I have written the necessary doc or comment.
• I have added the necessary unit tests and all cases have passed.

[psxjoy]

LGTM

[psxjoy]

Merging

[ongdisheng]

Hi @delei, great work on the rename! I noticed a couple of small issues in the website that were missed.

1. Fesod.read in website/docs/introduce.md:57 where the read example still uses Fesod.read instead of FesodSheet.read. The Chinese version already has this correct, but the English version was missed.

2. A few spots in the homepage translations still use Excel terminology instead of spreadsheet in website/i18n/en/code.json such as "reading and writing Excel files" and "large-scale Excel data".

Just wanted to flag these in case they were overlooked. If you'd like, I'm happy to submit a follow-up PR to fix them!

[delei]

Welcome, Please feel free to submit a PR to fix it at any time.