Include a custom logo for lune

[CompeyDev]

What's in this PR?

Currently, lune's branding is the "crescent moon" emoji (:crescent_moon:), which while being commonly accessible is quite generic and lacks identity to some extent. This PR includes variations of a custom logo for lune, which provides a sense of originality while being familiar (to the luau logo).

Breakdown

• This PR includes the following:
  • Updated README including the tilt-grid variant of the logo
  • Custom logos with variants and raster & vector exports

Previews

	Grid	No Grid
Tilt
No Tilt

[filiptibell]

Cool! I personally like the no-grid tilted logo the most. A couple questions:

• What font is used for the text?
• What does the logo look like on a dark vs light background?
• The moon shape is a bit difficult to see at common icon sizes (like 16px, 24px), maybe the shape can be tweaked to preserve the moon shape at these sizes better?

[CompeyDev]

1. Roboto is the font used, its a classic!
2. Logo contrasts quite well with a dark and light background.

4. Ah, you're right, I'll make it a little bigger (soon, a bit busy at the moment).

[CompeyDev]

• The moon shape is a bit difficult to see at common icon sizes (like 16px, 24px), maybe the shape can be tweaked to preserve the moon shape at these sizes better?

I've enlarged the moons and exported the assets as *.ico icon files (which are automatically scalable to common icon sizes such as 16px, 32px, and 480px).