Ignore Vim swap files in .gitignore
Fix rotation of hearts for Chrome

The two fixed hearts are rotated by 15 degrees. The CSS code for
this works for Firefox but not for Chrome. Make it work for
Chrome.
Add a smaller welcome image in the page

The welcome image shot in UB City is 1.23 MB in size and takes
noticeable time to load on slow connection. Use a smaller image
file for this picture that is 80.1 KB in size instead. Turn this
image into a hyperlink that links to the larger image.