Revert "chore: add discontinuation notices"

This reverts commit 8c9d83851d.

docs/1a/ece105.md

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 # ECE 105: Classical Mechanics
 
-!!! warning
-    <p style="font-size: 1rem">**The Eifueo project is no longer maintained
-    as of 19 April 2023. Information in this repository may no longer be accurate.
-    Please see [the main blog post](https://eggworld.me/blog/2023/sunsetting-eifueo) for more details.**</p>
-
 ## Motion
 
 Please see [SL Physics 1#2.1 - Motion](/g11/sph3u7/#21-motion) for more information.

docs/1a/ece150.md

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 # ECE 150: C++
 
-!!! warning
-    <p style="font-size: 1rem">**The Eifueo project is no longer maintained
-    as of 19 April 2023. Information in this repository may no longer be accurate.
-    Please see [the main blog post](https://eggworld.me/blog/2023/sunsetting-eifueo) for more details.**</p>
-
 ## Non-decimal numbers
 
 Binary numbers are prefixed with `0b`.

docs/1a/math115.md

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 # MATH 115: Linear Algebra
 
-!!! warning
-    <p style="font-size: 1rem">**The Eifueo project is no longer maintained
-    as of 19 April 2023. Information in this repository may no longer be accurate.
-    Please see [the main blog post](https://eggworld.me/blog/2023/sunsetting-eifueo) for more details.**</p>
-
 ## Set theory
 
 !!! definition

docs/1a/math117.md

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 # MATH 117: Calculus 1
 
-!!! warning
-    <p style="font-size: 1rem">**The Eifueo project is no longer maintained
-    as of 19 April 2023. Information in this repository may no longer be accurate.
-    Please see [the main blog post](https://eggworld.me/blog/2023/sunsetting-eifueo) for more details.**</p>
-
 ## Functions
 
 A **function** is a rule where each input has exactly one output, which can be determined by the **vertical line test**.