update for 24.09

[ironAiken2]

With the release of version 24.09, the Backend.AI webui docs require a version update.
Teams

[sessions] : docs: add session history feature, folder explorer and folder create modal descriptions #86 @ironAiken2
[model_serving] : docs: update images and add links to related page #87 @ironAiken2
[import_run] : docs: update images in import_run page #88 @ironAiken2
[vfolder] : docs: update vfolder images and descriptions #89 @ironAiken2
[mount_vfolder] : docs: use folder explorer and create a new folder in session launcher #90 @ironAiken2
[share_vfolder] : docs: update images and add description of default session launcher #91 @ironAiken2
[user_settings] : docs: update images and add 'classic session launcher' description #92 @ironAiken2
[admin_menu] : docs: update images and add 'resource policy setting in user modify modal` description #93 @ironAiken2
[Appendix] : docs: update images for neo session launcher #94 @ironAiken2