Merge pull request #1 from Sanwuist/add-homepage

add index page
Merge branch 'add-homepage'
add google map
add google map
Merge pull request #2 from Sanwuist/add-google-map

Todo: add right position; add logo and information
add footer
Merge pull request #3 from Sanwuist/add-footer

add footer
implement home page layout