Ampliar os valores a serem convertidos 

### Descrição da tarefa
Completar o PR #61, considerando todos os `<font face="symbol">` descritos em: 

[Symbol font – Unicode alternatives for Greek and special characters in HTML_files.zip](https://github.com/user-attachments/files/16681239/Symbol.font.Unicode.alternatives.for.Greek.and.special.characters.in.HTML_files.zip)

(fonte: https://www.alanwood.net/demos/symbol.html)

