Remove Tide support and documentation references

[lambda-fairy]

The repo hasn't been updated in 3 years, and it transitively depends on a version of rustix that no longer builds:

error: attributes starting with `rustc` are reserved for use by the `rustc` compiler
  --> /home/runner/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/rustix-0.37.28/src/backend/linux_raw/io/errno.rs:28:25
   |
28 | #[cfg_attr(rustc_attrs, rustc_layout_scalar_valid_range_start(0xf001))]
   |                         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

Unless someone fixes the Tide build I'm keen to remove it for the time being.