compatibility: remove stale WezTerm AppImage functions from hpc/.bashrc

[stanfish06]

Current state\n\nhpc/.bashrc still contains two functions that hardcode a specific 2022 WezTerm AppImage filename:\n\nbash\nfunction imgcat() {\n\t~/WezTerm-20221119-145034-49b9839f-Ubuntu18.04.AppImage imgcat \"$1\"\n}\n\nfunction fzf-img() {\n\tlocal width=\"${1:-auto}\"\n\tfzf --preview \"case {} in\n\t\t*.png|*.jpg|*.tif) ~/WezTerm-20221119-145034-49b9839f-Ubuntu18.04.AppImage imgcat --width $width {} ;;\n\t\t*) echo not image ;;\n\tesac\" --preview-window='down'\n}\n\n\nBoth will silently fail on any HPC session that doesn't have that exact binary at ~/. The kitty replacements already exist in the same file:\n\nbash\nalias icat=\"kitten icat\" # replaces imgcat()\nfunction fzf-kitty-img() { ... } # replaces fzf-img()\n\n\n## Suggested fix\n\nRemove imgcat() and fzf-img() entirely — their kitten equivalents (icat and fzf-kitty-img) already cover the same use cases.\n\nNote: PR #90 proposed the same fix but was closed without merging.