Update dstack server CLI logo

[r4victor]

Current ascii logo eats too much vertical space and looks out of place compared to other logs. Printed something more readable.

Old:

dstack server --log-level=debug --port 8000
╱╱╭╮╱╱╭╮╱╱╱╱╱╱╭╮
╱╱┃┃╱╭╯╰╮╱╱╱╱╱┃┃
╭━╯┣━┻╮╭╋━━┳━━┫┃╭╮
┃╭╮┃━━┫┃┃╭╮┃╭━┫╰╯╯
┃╰╯┣━━┃╰┫╭╮┃╰━┫╭╮╮
╰━━┻━━┻━┻╯╰┻━━┻╯╰╯
╭━━┳━━┳━┳╮╭┳━━┳━╮
┃━━┫┃━┫╭┫╰╯┃┃━┫╭╯
┣━━┃┃━┫┃╰╮╭┫┃━┫┃
╰━━┻━━┻╯╱╰╯╰━━┻╯

[12:14:57] INFO     Applying ~/.dstack/server/config.yml...
[12:15:07] DEBUG    dstack._internal.server.services.plugins:77 Found not enabled builtin
                    plugin rest_plugin. Plugin will not be loaded.
           DEBUG    dstack._internal.server.app:173 Job network mode: HOST_WHEN_POSSIBLE (2)
           INFO     The admin token is be68ae95-050f-472f-84c1-5c25ac898b52
           INFO     The dstack server (no version) is running at http://127.0.0.1:8000

New:

dstack server --log-level=debug --port 8000
        _     _             _
     __| |___| |_ __ _  ___| | __  ___  ___ _ ____   _____ _ __
    / _` / __| __/ _` |/ __| |/ / / __|/ _ \ '__\ \ / / _ \ '__|
   | (_| \__ \ || (_| | (__|   <  \__ \  __/ |   \ V /  __/ |
    \__,_|___/\__\__,_|\___|_|\_\ |___/\___|_|    \_/ \___|_|

[12:14:17] INFO     Applying ~/.dstack/server/config.yml...
[12:14:26] DEBUG    dstack._internal.server.services.plugins:77 Found not enabled builtin
                    plugin rest_plugin. Plugin will not be loaded.
           DEBUG    dstack._internal.server.app:173 Job network mode: HOST_WHEN_POSSIBLE (2)
           INFO     The admin token is be68ae95-050f-472f-84c1-5c25ac898b52
           INFO     The dstack server (no version) is running at http://127.0.0.1:8000