Fix loading custom dashboard_info in /old dashboard

[jacekkolasa]

Summary

fixes #9787
Old dashboard accessed with /old suffix was not loading custom dashboard_info.js files.

Component Name

web

Test Plan

In /etc/netdata.conf

[web]
   custom dashboard_info.js = dashboard_info_custom.js

dashboard should not show error, and the dashboard_info_custom.js file should be loaded by browser.

[thiagoftsm]

I copied my dashboard_info.js to dashboard_info_custom.js as suggested and I had 200 result using react dashboard and /old. LGTM!

[thiagoftsm]

@jacekkolasa and @joelhans , I observed that when I ran the next command:

bash-5.0$ grep -r "custom dashboard_info.js" *

I only had the option inside our source code, but we do not have any information inside our documentation file, please, can you made another PR given more details about the option custom dashboard_info.js? Thank you!

[jacekkolasa]

@thiagoftsm thanks for checking!
Actually we have documentation for this feature, here - https://learn.netdata.cloud/docs/agent/web/gui#customizing-the-standard-dashboard

[thiagoftsm]

@thiagoftsm thanks for checking!
Actually we have documentation for this feature, here - https://learn.netdata.cloud/docs/agent/web/gui#customizing-the-standard-dashboard

Thank you, I missed this reference when I ran a grep! :)