fix modes on files (why were these all executable?)

diff --git a/about.shtml b/about.shtml
old mode 100755 (executable)
new mode 100644 (file)

diff --git a/doctype.txt b/doctype.txt
old mode 100755 (executable)
new mode 100644 (file)

diff --git a/footer.shtml b/footer.shtml
old mode 100755 (executable)
new mode 100644 (file)

diff --git a/head.shtml b/head.shtml
old mode 100755 (executable)
new mode 100644 (file)

diff --git a/header.shtml b/header.shtml
old mode 100755 (executable)
new mode 100644 (file)

diff --git a/index.shtml b/index.shtml
old mode 100755 (executable)
new mode 100644 (file)

diff --git a/licence.shtml b/licence.shtml
old mode 100755 (executable)
new mode 100644 (file)

diff --git a/navigation.shtml b/navigation.shtml
old mode 100755 (executable)
new mode 100644 (file)

diff --git a/pgp_public_key.asc b/pgp_public_key.asc
old mode 100755 (executable)
new mode 100644 (file)

diff --git a/sitename.txt b/sitename.txt
old mode 100755 (executable)
new mode 100644 (file)

diff --git a/style.css b/style.css
old mode 100755 (executable)
new mode 100644 (file)

diff --git a/tutorials/915resolution.shtml b/tutorials/915resolution.shtml
old mode 100755 (executable)
new mode 100644 (file)

diff --git a/tutorials/index.shtml b/tutorials/index.shtml
old mode 100755 (executable)
new mode 100644 (file)

diff --git a/ugly.shtml b/ugly.shtml
old mode 100755 (executable)
new mode 100644 (file)