web: The new logo for paraslash-0.7.

This new svg logo was not made with a graphical editor but with a
plain text exitor. Unfortunately, ImageMagick is unable to create
a working .ico file from the svg source. Therefore we continue to
carry a manually created .ico file in the repo.

The new logo is less wide than the previous one, and it does not look
nice when it floats to the right side of its tabular cell. Fortunately
this can be fixed by removing some code from the style sheet.