[bug] copying raw pastes lead to double blank lines

**describe the bug**
when navigating to the raw dump of a paste (https://paste.myst.rs/raw/*/*), the provided result is given with header text/html and when copied, every line is separated by an additional blank line that shouldn't exist in the actual text.

**to reproduce**
steps to reproduce the behavior:
1. view a paste
2. click "raw"
3. copy the text
4. paste in notepad or any text editor to view it

**expected behavior**
copying the text should omit blank lines. ideally, when viewing the raw of a paste, the server should respond with content-type text/plain, and just dump the contents of the paste as it is in plain text.

**screenshots**
n/a

**device and browser:**
(though this is irrelevant)
- os: windows
- browser: firefox
- browser version: 116.0.1

**additional context**
n/a