Cleanup: remove old step files, scripts, rearrange steps

[pretorh]

Remove scripts no longer needed after LFS 10, LFS 11. Remove step files that are deprecated. Rearrange and renumber the step and script files

[pretorh]

todo:

• rename files to be in correct order (Cleanup: remove unused script files, re-arrange step files #11)
• rename scripts (Cleanup: remove unused script files, re-arrange step files #11 and Cleanup: move/rearrange/rename script files #12)
• general step cleanup (fix headings, add index for steps) (Cleanup: change step headings, create index table #17)
• script cleanup (recheck usage, rearrange and rename) (Cleanup: rearrange scripts #18)
• combine system config and finalize as the last step (move bootable before it)