Adjust homepage to try to better appeal to new members

[brittag]

This change:

• Adds "community workshop" to the headline, equal to the concept of "hacker/maker space".
• Moves up our open-ended description of who is eligible for membership.
• Removes the application deadline on the homepage, since we're aiming to have ongoing applications instead of a defined period.
• Emphasizes our low dues
• States that we are volunteer-run