remove documentation, metadata, etc

This drastically reduces the maintenance burden.

You may notice the `CODE_OF_CONDUCT.md` is deleted here. This is because
I don't feel like updating the relevant parts and I don't think this
will ever actually have a community build around it. If that changes for
some reason, I'm not opposed to adding a code of conduct again.

.gitignore

@@ -1,76 +0,0 @@
-# CMake
-cmake-build-*/
-
-# IntelliJ
-.idea/
-out/
-*.iml
-modules.xml
-*.ipr
-
-# mpeltonen/sbt-idea plugin
-.idea_modules/
-
-# Linux backup files
-*~
-
-# temporary files which can be created if a process still has a handle open of a deleted file
-.fuse_hidden*
-
-# KDE directory preferences
-.directory
-
-# Linux trash folder which might appear on any partition or disk
-.Trash-*
-
-# .nfs files are created when an open file is removed but is still being accessed
-.nfs*
-
-# Rust
-/target/
-
-### vscode ###
-.vscode/*
-!.vscode/tasks.json
-!.vscode/launch.json
-!.vscode/extensions.json
-*.code-workspace
-
-### Windows ###
-# Windows thumbnail cache files
-Thumbs.db
-Thumbs.db:encryptable
-ehthumbs.db
-ehthumbs_vista.db
-
-# Dump file
-*.stackdump
-
-# Folder config file
-[Dd]esktop.ini
-
-# Recycle Bin used on file shares
-$RECYCLE.BIN/
-
-# Windows shortcuts
-*.lnk
-
-# Conduit
-conduit.toml
-conduit.db
-
-# Etc.
-**/*.rs.bk
-cached_target
-
-# Nix artifacts
-/result*
-
-# Direnv cache
-/.direnv
-
-# Gitlab CI cache
-/.gitlab-ci.d
-
-# mdbook output
-public/