chore: replace text paths with text element

[SethFalco]

Makes two minor changes:

• In the Open Graph tags, the description now specifies "vector images" rather than just "vectors", which should be clearer.
• In svgo_hackerman.svg, Inkscape converted the text svgo --help to paths. This makes sense in most cases, so clients don't have the specific font installed that was used during the SVGs creation. However, for us the literal text with a font stack specified in CSS is perfectly acceptable. This reduces the filesize by 4.1 KB or around 13%.
  • This works as expected when standalone, inline an HTML document, and when used as a data URI in an <img> tag.

Before

After