* added tutorials page and blog tutorial

* proof reading, some language improvements

* split blog tutorial into parts

and reworked on the basis of comments, improved language, added missing
things

* + custom slugify function example

* +blog tutorial on engagement

* + section blog ToC

* + instructions for X/FB share buttons and started discussion system

* fix: module name `code` shadowed Python standard library module

* added What's next section

* +blog tutorial engagement part

* fix: updated Giscus code snippet

* trying multiple tutorials with headings for each group

* + basic social cards tutorial

* + custom social card tutorial

* + estimated time for custom card tutorial

* added tutorial sections to nav

* fixed typos, removed sponsor icon from level one heading

* removed "tutorial" from level one heading

* added headings to custom layout example

* fixed broken link

* fixes after run-through, added links to template repos

* added comment for @squidfunk

* clarified use of logos, some proof-reading

* removed question I left for @squidfunk

* clarified relationship between background color and image

* added override for the background image

* fixed wording and indentation

* changed example to be releases, not events

* being more specific where to add the last bit of code in the layout

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Co-authored-by: squidfunk <martin.donath@squidfunk.com>