Shorthand for internal links

[that-hatter]

Currently, linking to other entries involves writing out their relative link. A shorthand might be preferred.
Some possible ways would be:

• prefixing them with some seldom used character like $
• assuming all text inside inline code that matches an api entry's name is referring to that api entry

Both these approaches will need to consider cases where a name matches two entries, such as $Card matching both the Card type entry and Card namespace entry.

Linking to a specific overload of a function/function type is also currently not possible but could be supported either by adding a name field to overloads or indexing overloads by number.

[that-hatter]

I'm considering going with the second idea, but adding bold text to refer to non-code entries.
Essentially, if a text is an InlineCode and it matches a namespace, function, or constant's name, it's assumed to be referring to that namespace/function/constant entry.
Meanwhile if it is a BoldText and it matches a type, enum, or tag's name, it's assumed to be referring to that type/enum/tag.

This naturally differentiates Card (the namespace) and Card (the type).
This means for the specs, there should be no duplicate names among functions, constants, and namespaces. Likewise among types, enums, and tags.