docs(FR-781): add start page guide docs

[ironAiken2]

resolves FR-781

Add the start page section of the WebUI User Guide

Backend.AI Web-UI User Guide (en) - start page.pdf
Backend.AI Web-UI User Guide (ko) - start page.pdf

[ironAiken2]

• docs(FR-746): update version numbers to 25.05 #119
• docs(FR-812): update statistics page #115
• docs(FR-811): update ssh/sftp connection to a compute session page #114
• docs(FR-808): update user settings page #113
• docs(FR-805): update cluster compute session page #111
• docs(FR-798): update admin menu page docs #108
• docs(FR-797): update appendix page docs #106
• docs(FR-829): update agent summary docs #118
• docs(FR-828): update my environments docs #117
• docs(FR-825): update sharing vfolder docs #116
• docs(FR-809): update mount vfolder docs #112
• docs(FR-806): update import and run page guide docs #110
• docs(FR-804): change LLM playground to Chat and update docs #109
• docs(FR-799): update model service page #107
• docs(FR-795): update session page #105
• docs(FR-789): update data page #104
• docs(FR-786): update summary page #103
• docs(FR-785): add top bar features guide docs #102
• docs(FR-781): add start page guide docs #101 👈 (View in Graphite)
• docs(FR-751): Update login page guide docs #100
• main

This stack of pull requests is managed by Graphite. Learn more about stacking.

[agatha197]

LGTM

[YEONFEEL96]

Changed some sentence structure to increase clarity.

[agatha197]

LGTM

[YEONFEEL96]

LGTM

[ironAiken2]

Merge activity

• Apr 18, 3:50 AM EDT: A user started a stack merge that includes this pull request via Graphite.
• Apr 18, 3:53 AM EDT: Graphite rebased this pull request as part of a merge.
• Apr 18, 3:54 AM EDT: A user merged this pull request with Graphite.