What is "hardcoding"?

[doodlemancy]

I just joined a community and read their rules and it says "please don't hardcode your entries".

I cannot for the life of me find a definition of "hardcode" anywhere, at least not in the context of Dreamwidth. Doesn't seem to be on the jargon page of the wiki. What does that mean? Also is it generally unwelcome in communities, whatever it is?

Edit: thank you! I have been educated!!! I had totally forgotten about this aspect of journaling sites.