Add and resolve an obscene amount of lints

docs/notes.md

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+# Notes
+
+## CI
+
+When adding CI jobs, consider the following lints:
+
+- `clippy::dbg_macro`
+- `clippy::print_stderr`
+- `clippy::print_stdout`
+- `clippy::todo`
+- `clippy::unimplemented`
+- `clippy::unreachable`
+- `clippy::use_debug`
+
+## BTreeMap
+
+Consider replacing HashMap with BTreeMap to stop nodes from shifting position constantly on every page load.
+
+See also:
+    - <https://doc.rust-lang.org/std/collections/struct.BTreeMap.html#background>
+    - `clippy::iter_over_hash_type`
+