docs(chore): convert svg files to png

Done with ImageMagick, see: https://askubuntu.com/a/1427738

docs/en/calculators/par/theorie_fatou.md

@@ -14,15 +14,15 @@ $$ Q^* = \dfrac{Q}{\sqrt{g}L^{2,5}} $$
 
  to upstream head \(ha\) and the average water level in the pass \(h\) :
 
-![Abacuses of a Fatou baffle fishway for a slope of 10%](baffle_fishway_Fatou_slope_10_.svg)
+![Abacuses of a Fatou baffle fishway for a slope of 10%](baffle_fishway_Fatou_slope_10_.png)
 
 *Abacuses of a Fatou baffle fishway for a slope of 10% (Excerpt from Larinier, 2002[^1])*
 
-![Abacuses of a Fatou baffle fishway for a slope of 15%](baffle_fishway_Fatou_slope_15_.svg)
+![Abacuses of a Fatou baffle fishway for a slope of 15%](baffle_fishway_Fatou_slope_15_.png)
 
 *Abacuses of a Fatou baffle fishway for a slope of 15% (Excerpt from Larinier, 2002[^1])*
 
-![Abacuses of a Fatou baffle fishway for a slope of 20%](baffle_fishway_Fatou_slope_20_.svg)
+![Abacuses of a Fatou baffle fishway for a slope of 20%](baffle_fishway_Fatou_slope_20_.png)
 
 *Abacuses of a Fatou baffle fishway for a slope of 20% (Excerpt from Larinier, 2002[^1])*
 

docs/en/calculators/par/theorie_mixte.md

@@ -12,11 +12,11 @@ $$ q^* = \dfrac{Q/L}{\sqrt{2g}a^{1,5}} $$
 
  to upstream head \(ha\) and the average water level in the pass \(h\) :
 
-![Abacuses of a mixed / chevron baffles fishway for a slope of 10%](baffle_fishway_mixte_slope_10_.svg)
+![Abacuses of a mixed / chevron baffles fishway for a slope of 10%](baffle_fishway_mixte_slope_10_.png)
 
 *Abacuses of a mixed / chevron baffles fishway for a slope of 10% (Excerpt from Larinier, 2002[^1])*
 
-![Abacuses of a mixed / chevron baffles fishway for a slope of 16%](baffle_fishway_mixte_slope_16_.svg)
+![Abacuses of a mixed / chevron baffles fishway for a slope of 16%](baffle_fishway_mixte_slope_16_.png)
 
 *Abacuses of a mixed / chevron baffles fishway for a slope of 15% (Excerpt from Larinier, 2002[^1])*
 

docs/en/calculators/par/theorie_plans.md

@@ -14,15 +14,15 @@ $$ Q^* = \dfrac{Q}{\sqrt{g}L^{2,5}} $$
 
  to upstream head \(ha\) and the average water level in the pass \(h\) :
 
-![Abacuses of a plane baffles (Denil) fishway for a slope of 10%](baffle_fishway_plans_slope_10_.svg)
+![Abacuses of a plane baffles (Denil) fishway for a slope of 10%](baffle_fishway_plans_slope_10_.png)
 
 *Abacuses of a plane baffles (Denil) fishway for a slope of 10% (Excerpt from Larinier, 2002[^1])*
 
-![Abacuses of a plane baffles (Denil) fishway for a slope of 15%](baffle_fishway_plans_slope_15_.svg)
+![Abacuses of a plane baffles (Denil) fishway for a slope of 15%](baffle_fishway_plans_slope_15_.png)
 
 *Abacuses of a plane baffles (Denil) fishway for a slope of 15% (Excerpt from Larinier, 2002[^1])*
 
-![Abacuses of a plane baffles (Denil) fishway for a slope of 20%](baffle_fishway_plans_slope_20_.svg)
+![Abacuses of a plane baffles (Denil) fishway for a slope of 20%](baffle_fishway_plans_slope_20_.png)
 
 *Abacuses of a plane baffles (Denil) fishway for a slope of 20% (Excerpt from Larinier, 2002[^1])*
 

docs/en/calculators/par/theorie_suractif.md

@@ -12,11 +12,11 @@ $$ q^* = \dfrac{Q/L}{\sqrt{2g}a^{1,5}} $$
 
  to upstream head \(ha\) and the average water level in the pass \(h\) :
 
-![Abacuses of a superactive baffles fishway for a slope of 10%](baffle_fishway_suractif_slope_10_.svg)
+![Abacuses of a superactive baffles fishway for a slope of 10%](baffle_fishway_suractif_slope_10_.png)
 
 *Abacuses of a superactive baffles fishway for a slope of 10% (Excerpt from Larinier, 2002[^1])*
 
-![Abacuses of a superactive baffles fishway for a slope of 15%](baffle_fishway_suractif_slope_15_.svg)
+![Abacuses of a superactive baffles fishway for a slope of 15%](baffle_fishway_suractif_slope_15_.png)
 
 *Abacuses of a superactive baffles fishway for a slope of 15% (Excerpt from Larinier, 2002[^1])*