docs: Improve Javascript Anchor Types reference

[acheroncrypto]

Problem

JavaScript Anchor Types has the following problems:

• It's not possible to link an individual type e.g. if someone specifically asks for how to pass enums from TS, we should be able to link that section specifically https://www.anchor-lang.com/docs/javascript-anchor-types#enum
• All examples include the same boilerplate await program.methods.init(<VAL>).rpc(); when we only care about the <VAL>
• In "Javascript Type" column, there are TS types such as Array<T>, meaning table column can be renamed from "JavaScript Type" to "TypeScript Type"
• "Note" column doesn't include any notes other than linking https://github.com/indutny/bn.js, which is not very useful and takes up a large space

Summary of changes

• Make indiviual types from the page linkable
• Remove the boilerplate from the examples and only include the example value(s)
• Add "Type" column
• Rename "Rust Type" to "Rust"
• Rename "Javascript Type" to "TypeScript"
• Remove "Note" column

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