feat: add new icon styles and update all fonts

[Angelmmiguel]

Update all the new icon styles and update existing fonts. Now, developers can select between the five different icon styles:

• Regular
• Sharp
• Round
• Two Tone
• Outlined

Every style is defined in a separate stylesheet. This feature allows developers to select only the styles required for ttheir projects. It avoids to load all font files if they are not used.

To cover the new styles, I introduced a four new helper methods:

• mi.outlined.shape(:home)
• mi.sharp.shape(:home)
• mi.outlined.shape(:home)
• mi.twotone.shape(:home)

As you can see in the following screenshot, it shows the selected style:

I also updated the README.md file with all the instructions about how to use these styles.

This PR closes multiple issues:

• It closes Add support for other styles as well #27
• It closes Icons missing #45
• It closes Logout icon not working #35
• It closes Calendar_today icon #30