docs: remove math block example

Author: stelcodes

src/content/posts/showing-off-blog-features/index.md

@@ -218,42 +218,6 @@ Make those equations pretty! $ \frac{a}{b} \cdot b = a $
 
 Make those equations pretty! $ \frac{a}{b} \cdot b = a $
 
-You can use double dollar-sign to show a display-style formula.
-
-```
-Let's look at Einstein's great formula:
-$$
-E=mc^2
-$$
-```
-
-Let's look at Einstein's great formula:
-$$
-E=mc^2
-$$
-
-You can also number the formula.
-
-```
-The Pythagoras theorem is
-$$
-c^2=a^2+b^2\tag{1}
-$$
-It is very similar to Einstein's great formula
-$$
-E^2=m^2c^4+c^2p^2\tag{2}
-$$
-```
-
-The Pythagoras theorem is
-$$
-c^2=a^2+b^2\tag{1}
-$$
-It is very similar to Einstein's great formula
-$$
-E^2=m^2c^4+c^2p^2\tag{2}
-$$
-
 ## HTML Elements
 
 <button>A Button</button>