fix: vasp logo seems too big

[wesleyboar]

Warning

Instead, update logo; search, Wikipedia article.

Reduced size of VASP logo.

The logo seems unnecessarily large.

Why?

Because:

• the image resolution is too poor to merit that size
  ^{At a large size, the poor resolution is highlighted.}
• the image floats within two paragraphs and across a header
  ^{Floated images should not span paragraphs across sections (sections are demarcated by headings).}

before	after

Related:

• fix: matlab logo seems too big #119