Add Battery levels of dewars to tables on website

[LowriJenkins]

As a helium monitoring technician I would like to be able to check the battery levels of dewars by checking the website.

Acceptence criteria

• The Battery levels of dewars are displayed in the tables.
• The table can be sorted by battery level.
• If implemented after Add table to list all Dewars #16 the table added by it should also contain battery level.

[LowriJenkins]

This should be relativley simple as the information is already in the database.