docs: update the LeetCode contributing guide (#1225)

* Update README.md

Remove not actual information regrading the solutions list. Now it's updated automaticaly.

* updating DIRECTORY.md

* Update README.md

add note about automatically updating the `DIRECTORY.md` file

* Update leetcode/README.md

Co-authored-by: David Leal <[email protected]>

* updating DIRECTORY.md

---------

Co-authored-by: github-actions[bot] <[email protected]>
Co-authored-by: David Leal <[email protected]>

Author: 3 people

DIRECTORY.md

@@ -206,6 +206,7 @@
     * [1657](https://github.com/TheAlgorithms/C/blob/HEAD/leetcode/src/1657.c)
     * [169](https://github.com/TheAlgorithms/C/blob/HEAD/leetcode/src/169.c)
     * [1695](https://github.com/TheAlgorithms/C/blob/HEAD/leetcode/src/1695.c)
+    * [17](https://github.com/TheAlgorithms/C/blob/HEAD/leetcode/src/17.c)
     * [1704](https://github.com/TheAlgorithms/C/blob/HEAD/leetcode/src/1704.c)
     * [173](https://github.com/TheAlgorithms/C/blob/HEAD/leetcode/src/173.c)
     * [1752](https://github.com/TheAlgorithms/C/blob/HEAD/leetcode/src/1752.c)
@@ -264,6 +265,7 @@
     * [404](https://github.com/TheAlgorithms/C/blob/HEAD/leetcode/src/404.c)
     * [42](https://github.com/TheAlgorithms/C/blob/HEAD/leetcode/src/42.c)
     * [442](https://github.com/TheAlgorithms/C/blob/HEAD/leetcode/src/442.c)
+    * [45](https://github.com/TheAlgorithms/C/blob/HEAD/leetcode/src/45.c)
     * [461](https://github.com/TheAlgorithms/C/blob/HEAD/leetcode/src/461.c)
     * [476](https://github.com/TheAlgorithms/C/blob/HEAD/leetcode/src/476.c)
     * [485](https://github.com/TheAlgorithms/C/blob/HEAD/leetcode/src/485.c)

leetcode/README.md

@@ -39,16 +39,8 @@ If you have a solution to any of these problems (which are not being [**repeated
 4. Doxygen documentation isn't used in LeetCode solutions. Simple/small documentation or comments should be fine.
 5. Don't include libraries/headers such as `stdio.h`. Your file should be the solution to the problem only.
 
-### 📜 Adding your new solution to the list 📜
-
-Great! You've added your solution. Now, you'll have to add it to `leetcode/DIRECTORY.md`.\
-Please use numerical order. For example: if the solution's number is `98`, add your solution after `97`, if available.
-
-This is the required format for new solutinos:
-
-```markdown
-| <solution number>   | [<solution name>](<leetcode link to problem>)                                   | [C](./src/<filename>.c)   | <difficulty>     |
-```
+> **Note**
+> There was a requirement to update the `leetcode/DIRECTORY.md` file with details of the solved problem. It's not required anymore. The information about the problem is fetched automatically throughout the LeetCode API.
 
 ## 📦 Committing your changes 📦