Update (generator for) sample_text_editor.txt with Dina font rules

[clach04]

https://github.com/clach04/terminal_style_toolkit/blob/main/sample_text_editor.txt

From https://www.dcmembers.com/jibsen/download/61/

Motivation

In designing a programming font the following guidelines were followed:

    Monospaced
    Should be easy to distinguish between `j i l 1 I`
    Should be easy to distinguish between `o O 0`
    Operators should line up horizontally `- + * =`
    Brackets should line up horizontally and vertically `< ( { [ ] } ) >`
    Punctuation should be clear `., :; ' "`
    Symbols used in programming languages should look right `& @ % $ #`
    No other characters that look too similar `gqy z2Z s5S 8B CG6 DO uv`
    Still has to be pleasant to read passages of text