Suggestions and possible typos

[learnbyexample]

1. Suggestion - use light theme for CSS code snippet when switching theme for the python -m textual demo:

2. Terminal title in screenshots for https://textual.textualize.io/tutorial/ - would suggest screenshots discussed under stopwatch01.py to use the script name at the top

02 to 06 have script name at the top, for example:

3. https://textual.textualize.io/tutorial/#css-basics illustration: background color is $panel-darken-1 in the figure but the CSS code uses background: $boost;

4. https://textual.textualize.io/guide/actions/#screenshot - description column says ~/ and default column says ./

[davep]

Good catch on 4, fixed that while tidying some other docstring things: bc851d5466679723e4725194fe7987648f65b753

(others will likely get reviewed early next week as they're in the docs themselves, but 4 was a docstring and I happened to be passing that way)

[willmcgugan]

Fixed, with the exception of the color theme changing code. Which we might do at some point in the future.

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