Resolve "Make a single script directory to host them all"

Closes #34 (closed) (single script directory)
Which, in turn, closes #4 (closed) (sorting scripts between offense and defense)
Closes #42 (closed) (GH update)
In order to reduce the number of conflicting MR, some small unrelated changes have been added:
Closes #50 (closed) (wrong perm check when deleting a file)
Progress towards #49 (virtual shell), #51 (descalation into guest) and #2 (log removal)
If !52 (merged) has been merged:
Closes #21 (closed) (preproc explanations outside README.md)
Closes #47 (closed) (splitted archives support)
Which, in turn, closes #6 (closed) (creating a tar file then untar it)
If !54 (merged) has been merged:
Closes #30 (closed) (design a private website)
If !53 (merged) has been merged:
Closes #48 (closed) (fake ssh for proxies)