docs: emphasize automatic type inference in TypeScript intro and statics/methods, remove duplicated statics.md

[vkarpov15]

Summary

Re: discussion from mongoosejs/mongoose-lean-virtuals#78. I made the top-level typescript.md TypeScript intro emphasize using automatic type inference, as well as statics-and-methods.md. In general, I copied over statics.md into statics-and-methods.md and removed statics.md, because we don't link to statics.md anywhere but the content is more up-to-date than statics-and-methods.md.

Examples

[Copilot]

Pull Request Overview

This PR updates the TypeScript documentation to emphasize Mongoose's automatic type inference for statics and methods while removing the duplicated statics.md file.

• Merged and updated content on statics and methods into a single file.
• Revised code samples and documentation in the TypeScript guide to reflect automatic type inference usage.
• Removed the deprecated docs/typescript/statics.md file.

Reviewed Changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated no comments.

File	Description
docs/typescript/statics.md	Removed redundant content now merged into statics-and-methods.md.
docs/typescript/statics-and-methods.md	Updated documentation and code samples for statics and methods with emphasis on automatic type inference.
docs/typescript.md	Revised introductory guide with updated code samples and link text adjustments.

Comments suppressed due to low confidence (2)

docs/typescript/statics-and-methods.md:1

• [nitpick] The header in this file is now 'Statics in TypeScript' which may be inconsistent with its filename ('statics-and-methods.md') if both statics and methods are intended to be covered. Consider aligning the header with the file name or adjusting the filename for clarity.

# Statics in TypeScript

docs/typescript.md:143

• [nitpick] The link text refers to 'methods in TypeScript', but the target file's header is 'Statics in TypeScript', which may be confusing. Verify the intended focus and update the link text or target file content to ensure consistency.

Now that you've seen the basics of how to use Mongoose in TypeScript, let's take a look at [methods in TypeScript](typescript/statics-and-methods.html).

[hasezoey]

Mostly looks good to me, though there are some invalid links and a incomplete sentence and some typos.