Overhaul landing page

[gbrannigan]

• Drop down to choose between options for entry, rather than having multiple "Compute" buttons
• Change "Compute" to "Blobulate!" in honor of Mr. Chris Brannigan
• Add 3rd option to upload files
• Change "protein selection" to "select input method"
• Remove statement about how long it will take to blobulate protein if an ID is used
• Change note about human proteins to "Note: only human proteins will display disease-associated mutations, and will take longer to load"
• Move warning further up the page, remove capitals, only show if phone is being used