Extend namedCodesToUnicode with own/specific html codes

[tangleMesh]

Would it be possible to extend the namedCodesToUnicode constant with custom html codes to display them correctly.

Therefore a new options.namedCodesToUnicode object could integrated to extend the existing constant list while keeping the list in this repository as small/clean as it is at the moment.

options.namedCodesToUnicode = options.namedCodesToUnicode ? {...namedCodesToUnicode, ...options.namedCodesToUnicode} : namedCodesToUnicode;

…
.replace(HTML_CHAR_CODE_R, (full, inner) => {
              return options.namedCodesToUnicode[inner]
                ? options.namedCodesToUnicode[inner]
                : full;
            }),
…

The documentation could also be extended and the new options could work like this:

options.namedCodesToUnicode

By default only a couple of named html codes are converted to unicode characters.

• & (&)
• ' (')
• > (>)
• < (<)
• ( )
• " (")

Some projects require to extend this map of named codes and unicode characters. To customize this list with additional html codes pass the option namedCodesToUnicode as object with the code names needed as in the example below:

<Markdown options={{ namedCodesToUnicode: {
    le: '\u2264',
    ge: '\u2265',
} }}>This text is &le; than this text.</Markdown>;

// or

compiler('This text is &le; than this text.', namedCodesToUnicode: {
    le: '\u2264',
    ge: '\u2265',
});

// renders:

<p>This text is ≤ than this text.</p>

[quantizor]

Hmm yeah that seems reasonable if you'd like to send a PR