* docs(wiki): add new Quickstart to help with using Sync
There is a slew of notes that try to explain or show this so a
Quickstart can help bring everything into one place.
* docs(wiki): combine "First Steps" into single note with relevant links
* docs(wiki): update index notes
* docs(wiki): fix remaining broken external links
* docs(wiki): add core developer How-To guides to orient first-time devs
The majority of the documentation is currently spread across several
files ins "docs/" and READMEs. Over time these can be consolidated into
the wiki while retaining the common CONTRIBUTING.md as a valid entry
point.
* docs(wiki): add basic guides for plugins and issue integration
As with the core development docs, there is too much to add here right
now. These notes will serve as a simple entry to other resources.
* docs(wiki): add basic reference note for theming
* docs(wiki): add basic Translation guide
* docs(wiki): rename Theming and linting to clean up headings
* docs(wiki): add heading lint exception for GH-specific nav pages; rework sidebar and index pages
Sidebar should be a quick-access for the more common topics grouped
thematically with the X.00 notes simply enumerating all the notes where
appropriate.
