docs: update images and add 'resource policy setting in user modify modal` description

[ironAiken2]

This PR is about updating admin_menu for 24.09

Changes:

• In the User Edit modal, you can set the resource policy to which the user belongs.
• The Resource Preset Settings modal automatically identifies available resources based on your server settings.
• Update images

Related PR:

• feat: user resource policy allocation in user setting modal backend.ai-webui#2749
• refactor: resource preset page backend.ai-webui#2656

PDF[ko] : 관리자 기능 — Backend.AI Web-UI User Guide 24.03 문서.pdf
PDF[en] : Admin Menus — Backend.AI Web-UI User Guide 24.03 documentation.pdf

[ironAiken2]

• docs: update images and add 'classic session launcher' description #92
• docs: update images and add description of default session launcher #91
• docs: update images and add links to related page #87
• docs: update images and add 'resource policy setting in user modify modal` description #93 👈 (View in Graphite)
• docs: update images for neo session launcher #94
• docs: update vfolder images and descriptions #89
• docs: add session history feature, folder explorer and folder create modal descriptions #86
• docs: use folder explorer and create a new folder in session launcher #90
• main

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[YEONFEEL96]

Small changes on expressions.

[agatha197]

LGTM