Display AGN variable dT model's parameters on webpage

[EvgeniiChaikin]

Note that

• The general expression is dT_AGN = dT_AGN_pivot * (M_BH / M_BH_pivot) ** slope with a constraint dT_AGN_min < dT_AGN < dT_AGN_max
• in the code, we always use the slope of 1
• in the code, the pivot and maximum temperatures are described by the same parameter. This is because the pivot point is arbitrary, so we don't really need an extra parameter to specify it; instead, we can just use either dT_AGN_min or dT_AGN_max.

The reason why I decided to display some extra information than in fact used internally in the code (5 params instead of 3), is to make the webpage more clear and less ambiguous