Add a spellchecker tool to CI and fix all existing typos.

.spelling

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+# markdown-spellcheck spelling configuration file
+# Format - lines beginning # are comments
+# global dictionary is at the start, file overrides afterwards
+# one word per line, to define a file override use ' - filename'
+# where filename is relative to this configuration file
+WIP
+envs
+anymore
+hostname
+hostnames
+Dockerfile
+helmfile
+k8s
+env
+dir
+dev'n'stages
+oi
+minio
+ArgoCD
+setups
+SRE
+autoscaler
+gitea
+vendoring
+cli
+vpa
+ok
+cmp
+config
+GitOps
+argo
+argocding
+cluster-1
+cluster-2
+cluster-3
+kubernetes
+argocd
+helmfiles
+plugin
+helmfile.yaml
+cleanup
+serie
+backend
+js
+frontend
+ShowToc
+cover.png
+allanger
+DIY
+DevOps
+funkwhale
+PSY
+bandcamp
+soundcloud
+spotify
+deezer
+prog-rock
+oveleane
+IDM
+gitlab
+bitwarden
+elasticsearch
+grafana
+lifecycle
+auditable
+the-first-production-grafaba
+grafana
+applicationsets
+helm-releases-v2
+yaml
+CR
+minecraft
+github
+ddosed
+VST
+Xfer
+plugins
+yabridgectl
+yabridge
+DAW
+polyverse
+camelcrusher
+standalone
+url
+glitchmachines
+MacBook
+configs
+behaviour
+FreqEcho
+DSP
+Supermassive
+Ableton
+Softube
+center
+iZotope
+V2
+auth
+README.md
+TAL-Chorus-LX
+badhouseplants
+Deelay
+Gatelab
+Filterstep
+Panflow
+PaulXStretch
+Audiomodern
+Kushview
+JUCE
+Melda
+MDrummer
+GBs
+laggy
+MDrumReplacer
+MPowerSynth
+MGuitarArchitect
+u-he
+TyrellN6
+Tyrell
+install.sh
+MGuitarArchitect
+Amazona.de.
+Bitwig
+ProjectSAM
+Pendulate
+Protoverb
+Eurorack
+S3
+XT
+Ruina
+VCV
+LFO
+ - themes/papermod/README.md
+PaperMod
+hugo-paper
+og
+ExampleSite
+exampleSite
+pipelining
+Fuse.js
+webpack
+nodejs
+Pagespeed
+Highlight.js