Max Mynter

Update paper.svg filler for 7.01 & 7.03

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as was done in #502 for tutorial exercises 7.02. With `fill="none"`, the business card paper background is not rendered. This PR changes to `fill="white"` in 7.01 and 7.03. (Really enjoying...

### What happened? Changes made in commit 9d1c7f6 as part of #7903 break file uploads using the `ObjectWriter`: ```bash ValueError: Must have exactly one of create/read/write/append mode and at most...

Make minimum width for line numbers in gutter configurable

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Closes #7334 # Changes This PR makes the minimum width allocated for line numbers in the side gutter configurable in units of character width via the `"line_number_base_width"` attribute in `gutter`...

Thank you for the books :) Done with the interpreter and will go through the compiler one soon!