Add Letterboxd

[carmoran0]

Thank you for your contribution! Before sending this Pull Request, please confirm the following:

• I have read the contributing guidelines
• I have run python check.py and received a ✅
• The icon's size is under 1,024 Bytes
• The layout of the SVG looks like this including newlines

<svg xmlns="http://www.w3.org/2000/svg"
aria-label="..." role="img"
viewBox="0 0 512 512"><path
d="m0 0H512V512H0"
fill="#fff"/> ... </svg>

If you have done the above, please send the Pull Request.

[edent]

This looks good - can you remove the Last.fm; just one logo per PR please.

[jmb]

Can you centre it up as well?

[carmoran0]

Sure, centered. Sorry about the pr, i thought i created another pr, i dont know how to separate them now :(

[jmb]

Looks good.

If you either update your branch/fork from the this repo or revert or untrack your copies of the lastfm files, I think that should do it.

[jmb]

I think you can optimise a bit more too... 😉