diff --git a/doc/img/bootstrap1.png b/doc/img/bootstrap1.png deleted file mode 100644 index 075930791b6..00000000000 Binary files a/doc/img/bootstrap1.png and /dev/null differ diff --git a/doc/img/bootstrap2.png b/doc/img/bootstrap2.png deleted file mode 100644 index 6461f818107..00000000000 Binary files a/doc/img/bootstrap2.png and /dev/null differ diff --git a/doc/img/bootstrap4.png b/doc/img/bootstrap4.png deleted file mode 100644 index ad69737922e..00000000000 Binary files a/doc/img/bootstrap4.png and /dev/null differ diff --git a/doc/img/bootstrap5.png b/doc/img/bootstrap5.png deleted file mode 100644 index d8d9baaf37a..00000000000 Binary files a/doc/img/bootstrap5.png and /dev/null differ