Create Site's Text Style and Icon Style themes

[faustobdls]

It is a suggestion to define the styles using extesions in Text and Icon, similar to what I implemented in issue # 9 to make it more elegant, improve visibility and help with the standardization of styles.

extension TextExtension on Text{
  Text titleInCards({TextStyle style}) {
    TextStyle defaultStyle = GoogleFonts.firaCode(
      fontSize: 55,
      fontStyle: FontStyle.normal,
      letterSpacing: -0.28,
      color: ThemeData().fPrimarySwatch[300],
    );
    return Text(this.data, style: (this.style ?? defaultStyle).merge(style ?? defaultStyle));
  }
}

---

extension IconExtension on Icon {
  Icon rapidLinks() {
    return Icon(
      this.icon,
      color: ThemeData().fWhiteColorF,
      size: 25,
    );
  }
}

---

For use

Text("<Vamos ser referências juntos>").titleInCards();
Icon(Icons.add).rapidLinks();

@irvine5k what do you think?

[irvine5k]

It's a good idea. I'll put priority in this issues to avoid conflicts in next issues.

[faustobdls]

ok @irvine5k thanks