Update Tracker and Index configuration

[josecelano]

The tracker and Index config files have changed.

Tracker:

• https://github.com/torrust/torrust-tracker/pull/992
• https://github.com/torrust/torrust-tracker/pull/991

Index:

• https://github.com/torrust/torrust-index/pull/700
• https://github.com/torrust/torrust-index/pull/699
• https://github.com/torrust/torrust-index/pull/698

[josecelano]

Closed by applying these updates.