Commits for rhead

Removed note about scheduled maintenance.
- src/hg/htdocs/indexIntro.html - lines changed 7, context: html, text, full: html, text
Changed link to NHGRI.gif to nhgriLogo.gif, as the filename of the image was changed.
- src/hg/htdocs/goldenPath/credits.html - lines changed 1, context: html, text, full: html, text
Renamed NHGRI.gif to nhgriLogo.gif because it was conflicting on filesystems that are not case-sensitive with the file nhgri.gif, also in this directory.
- src/hg/htdocs/images/NHGRI.gif - lines changed 0, context: html, text, full: html, text
- src/hg/htdocs/images/nhgriLogo.gif - lines changed 0, context: html, text, full: html, text
Updated git instructions: added links for installation and configuration, removed the gitroot directory reference, and removed instructions for customizing until we have decided what the best practice would be (or maybe this will go in genomewiki).
- src/hg/htdocs/admin/git.html - lines changed 89, context: html, text, full: html, text
- src/product/README.local.git.source - lines changed 59, context: html, text, full: html, text
Added a temporary note about upcoming schedule maintenance.
- src/hg/htdocs/indexIntro.html - lines changed 7, context: html, text, full: html, text