hosts: add READMEs (#50)
* mauville: add README
* mauville: added forĝejo docs and todo list
* github: ignore *.md files
* fallarbor: added README
* Fallarbor: correct hostname in README
* lavridge: added README
* petalburg: add README
* rustboro: add README
* lavaridge: update todo
* reformat markdown files with mdformat
* hosts/common: add README
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