Co-authored-by: natakazakova <17986517+natakazakova@users.noreply.github.com>

…dates (#6981)

* Use Babel's `format_datetime`, not `format_date`

I am using MkDocs-Material 9.5.15 and Babel 2.14.0. When setting the config value `blog.post_date_format: "yyyy-MM-dd hh:mm:ss"`, the blog plugin crashes during compilation with the error "date objects have no hour field".

I believe this is occurring because the plugin provides a `datetime` to `babel.dates.format_date`, which upcasts it to a plain, timeless, `date`. Making this change to use `babel.dates.format_datetime` instead resolved the error and demonstrated expected behavior.

While I recognize that it is likely uncommon for a blog to want to include sub-date timestamps in any of these fields, I believe that the current documentation,

> The format string must adhere to babel's pattern syntax and should not contain whitespace

implies that _any_ of Babel's pattern markers are acceptable here. I would consider 

> The format string must adhere to Babel's pattern syntax for calendar dates and should not contain whitespace

to also be a sufficient fix for this case.

----

Thank you for your effort in creating this project; it has been a wonderful benefit to my team, and this is the first minor problem we've had in months of using it.

* Make the change in src/, not material/

* fix(social): CairoSVG OSError handling in social plugin

Related issue: #6817

Co-authored-by: Guts <1596222+Guts@users.noreply.github.com>

* feat(docs): Add troubleshooting guide for CairoSVG crash

---------

Co-authored-by: Kamil Krzyśków <kamilzary@gmail.com>
Co-authored-by: Guts <1596222+Guts@users.noreply.github.com>
Co-authored-by: Martin Donath <martin.donath@squidfunk.com>

Unicode, case-sensitive reference setting causes error below.

```
yaml.constructor.ConstructorError: expected a mapping node, but found scalar
```

Update related sections in the documentation to address this issue.

Newer Python-Markdown has `slugify_unicode` built-in, so this

```yaml
markdown_extensions:
  - toc:
      slugify: !!python/name:markdown.extensions.toc.slugify_unicode
```

also works for case-insensitive use cases.

Fixes: ee1e675 ("Update slug reference")

Fix typos

Co-authored-by: stcksmsh <107367925+stcksmsh@users.noreply.github.com>