Doc: Wrap text in large grids

[geographika]

Fixes table formatting issues described in #2592 and #2563.

• WMS Preview
• WMTS Preview
• PDF Output

The same RST simple table format was used for both tables, as it is easier to read and edit in plain text. CSS was added for wrapping in HTML output (rather than a scrollbar). Some example URLs were shortened to fit within the column width.

To fix the PDF, additional settings were added to the preamble (settings inserted at the top of the document):

• \newcolumntype{P}[1]{>{\raggedright\hspace{0pt}\sloppy}p{#1}} - a new P column type that allows for text wrapping of long chunks of text / XML. raggedright turns off justification, sloppy helps LaTeX find a break for wrapping. \hspace{0pt} inserts a zero-width breakpoint so long strings can break
• \setlength{\emergencystretch}{3em} - helps with the wrapping by stretching text
• \setlength{\LTleft}{0pt} and \setlength{\LTright}{0pt} fixed issues with the table widths and gaps at the side (the longtable used by Sphinx for wide tables)
• https://ctan.org/pkg/xurl might be a useful option, but I avoided adding another package for now

Before:

After:

[rouault]

To fix the PDF, additional settings were added to the preamble

could you add the very helpful explanation of those cryptic commands in conf.py and that they are used for table formatting?