day1 README: remove useless html headers

2021/day01/README.txt

@@ -1,15 +1,3 @@
-
-Advent of Code
-
-    [About][Events][Shop][Settings][Log Out]
-
-Bruno Raoult 2*
-  {:year 2021}
-
-    [Calendar][AoC++][Sponsors][Leaderboard][Stats]
-
-Our sponsors help make Advent of Code possible:
-Ximedes - From Kotlin in the cloud to NodeJS in the terminal, our software powers payments and public transport ticketing all over the world.
 --- Day 1: Sonar Sweep ---
 
 You're minding your own business on a ship at sea when the overboard alarm goes off! You rush to see if you can help. Apparently, one of the Elves tripped and accidentally sent the sleigh keys flying into the ocean!

README.md

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 #### My solutions to the [2020](https://adventofcode.com/2020) and [2021](https://adventofcode.com/2021) [advent of code](https://adventofcode.com).
 
-#### My own rules for 2020 :
+#### My own rules :
  - **C** : Only *standard* libraries (for example, no external sort).
  - **bash**: Pure bash only: No external commands allowed (grep, sed, etc...).