bfsc: Change General header

This is a preliminary change to make the site distinguishable from openlilylib
copy .htaccess files in the subdirectories
bfsc: Add logo SVG file
bfsc: Use SVG logo in header

Initially adjust colors to make it visible at all.
Change heading font to serif as well

TODO: Is it possible to adjust the baseline of the image
(currently it doesn't match the following text)?
bfsc: Adapt general info and page footer
bfsc: prepare contact-about page stub
bfsc: re-rename contact-about.1col.txt

Documentation suggested to prefix file names.
It seems not to work.
bfsc: Fix image link in page header
bfsc: Fix about us page header
bfsc: Fix Capitalization in main nav bar
bfsc: Fix email address in page footer
bfsc: Remove "Getting Involved" page
bfsc: Add "Examples" page
bfsc: Fix imprint (purge oll references)
bfsc: Prepare Home page
bfsc: Remove lilyglyphs page
bfsc: Add Concepts page
bfsc: Remove Tutorials page
bfsc: Add Stub for Administering page

Lacking a suitable name for that page
bfsc: Remove lilypond-doc page