renamed *.shtml -> *.html at /server/staging/ssi/

diff --git a/server/staging/ssi/footer.shtml b/server/staging/ssi/footer.html
similarity index 100%
rename from server/staging/ssi/footer.shtml
rename to server/staging/ssi/footer.html

diff --git a/server/staging/ssi/header.shtml b/server/staging/ssi/header.html
similarity index 100%
rename from server/staging/ssi/header.shtml
rename to server/staging/ssi/header.html

diff --git a/server/staging/ssi/index..shtml b/server/staging/ssi/index.html
similarity index 100%
rename from server/staging/ssi/index..shtml
rename to server/staging/ssi/index.html