Revert "Make DOC text match Seb's"

This reverts commit e30f306711b9c84e1a0cde745846f229049182bb.
Revert "Adding DCO to code contribution page"

This reverts commit ce0636df3780ca41c2042be98555319ca6eec918.
Revert "Use user.name/user.email for DCO signed-off-by"

This reverts commit 087dadc01f9ac6075edf7f99e4f3ca1db0be512c.
Revert "Americanize and fix get->Git"

This reverts commit 7a5cb90548c02ae0865d5305ff67c90525513469.
Revert "Add section about the DCO to the source code page"

This reverts commit af43f67fe3c5db5aae1b5842904803fb7edda8ec.
Revert "Rename to hook to append .hook"

This reverts commit 421fca1227ddd8691a1f20b970d4fabd2c1c6352.
Revert "Fix CONTRIBUTING.md"

This reverts commit a6857ee92952495fa0296ba354f0e0be16283380.
Revert "Add section to CONTRIBUTING.md about signing and hooks"

This reverts commit 2ba480e914b6396d3ca89cce77f37790f74f3b25.
Revert "Fix header of commit preparation hook"

This reverts commit 2afae873ef3ef838bea2e83035dab5acee520f16.
Revert "Add commit preparation hook to downloads of contributing section"

This reverts commit fb8ab08056b0767fa4845e6a498a117c6c027b21.
Merge pull request #878 from sbesson/dco_revert

Dco revert