* attach cloud storages

"creating an annotation task", "projects", "export/import datasets" and "backup" docs were updated

* attach cloud storage(updated)

* Update site/content/en/docs/manual/advanced/backup.md
Co-authored-by: NMaria Khrustaleva <maya17grd@gmail.com>

* Update site/content/en/docs/manual/advanced/backup.md
Co-authored-by: NMaria Khrustaleva <maya17grd@gmail.com>

* Update site/content/en/docs/manual/advanced/export-import-datasets.md
Co-authored-by: NMaria Khrustaleva <maya17grd@gmail.com>

* Update site/content/en/docs/manual/advanced/export-import-datasets.md
Co-authored-by: NMaria Khrustaleva <maya17grd@gmail.com>

* Update site/content/en/docs/manual/advanced/export-import-datasets.md
Co-authored-by: NMaria Khrustaleva <maya17grd@gmail.com>

* Update site/content/en/docs/manual/basics/creating_an_annotation_task.md
Co-authored-by: NMaria Khrustaleva <maya17grd@gmail.com>

* Update site/content/en/docs/manual/basics/creating_an_annotation_task.md
Co-authored-by: NMaria Khrustaleva <maya17grd@gmail.com>

* Source & target storage(updated)

* added creating multi tasks doc

changed weights of docs in basics + replaced some images for the "creating an annotation task" doc

* added creating multi tasks doc(updated))

* added creating multi tasks doc(remark fixed)
Co-authored-by: NMaria Khrustaleva <maya17grd@gmail.com>