This updates eslint to lint on the toc.js.hbs file. This file uses a
small amount of hbs templating which eslint can't handle. This adds a
hacky preprocessor which will strips out the handlebars tags so that the
file can be linted.
This requires a switch to the configuration file format described at
https://eslint.org/docs/latest/use/configure/configuration-files. I used
the automatic tool to generate the new file, with some simplifications
around defaults.
- Removed no-cond-assign override, it is no longer needed.
- Fixed `catch (e)` where `e` is not used. This seems a little pedantic
to me, but seems like a relatively easy fix to just remove it, and I
believe the syntax without the variable has been supported for quite
some time. Alternatively it could also be `_e`, or explicitly allowed.
- Added `--no-warn-ignored` to the script since it was very noisy.
