feat: Add landing page and rename project to platypus in documentation

[yufeiminds]

FEATURES:

1. Add homepage and global CDN by Netlify
2. Rename the project to Platypus Programming Language in documentation

[guance-review-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: yufeiminds

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• OWNERS [yufeiminds]

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[guance-review-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: yufeiminds

The full list of commands accepted by this bot can be found here.

The pull request process is described here

Needs approval from an approver in each of these files:

• OWNERS [yufeiminds]

Approvers can indicate their approval by writing /approve in a comment
Approvers can cancel approval by writing /approve cancel in a comment

[codecov]

Codecov Report

❗ No coverage uploaded for pull request base (main@93d8e8e). Click here to learn what that means.
The diff coverage is n/a.

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[guance-bot]

/lgtm