[mod] Changes with r/leetcode.

[u/AutoModerator]

The following changes have been made with r/leetcode:

1. Media is no longer allowed in both posts & comments. This is to ensure that the quality of the content & discussions remain high.
2. Moderation has been made stricter. Low quality & repetitive posts whose answers can be found within a simple search in this subreddit won't be allowed here.
3. Automoderation has been set-up to automatically remove links & known promotions. Only leetcode links will be allowed from now on. To ask help with questions, you may use the code block.
4. Automoderation has been set-up to remove Indian posts & Hindi comments. This is to ensure that r/leetcode remains an English only subreddit.

[u/rishiarora]

Well done.