Upgrade eslint (#1014)

It's apparently forced now to use the eslint.config.js instead of
.eslintrc

It got more strict with requiring the underscore on unused vars like
`catch(_err)` , but that was all

Closes #1012
Closes #995
Closes #992

## Launch Checklist

<!-- Thanks for the PR! Feel free to add or remove items from the
checklist. -->


 - [ ] Briefly describe the changes in this PR.
 - [ ] Link to related issues.
- [ ] Include before/after visuals or gifs if this PR includes visual
changes.
 - [ ] Write tests for all new functionality.
 - [ ] Add an entry to `CHANGELOG.md` under the `## main` section.

src/libs/codemirror-mgl.ts

@@ -1,4 +1,4 @@
-// @ts-ignore - this is a fork of jsonlint
+// @ts-expect-error - this is a fork of jsonlint
 import jsonlint from 'jsonlint';
 import CodeMirror, { MarkerRange } from 'codemirror';
 import jsonToAst from 'json-to-ast';
@@ -33,7 +33,7 @@ CodeMirror.registerHelper("lint", "json", (text: string) => {
   try {
     jsonlint.parse(text);
   }
-  catch(e) {
+  catch(_e) {
     // Do nothing we catch the error above
   }
   return found;
@@ -55,7 +55,7 @@ CodeMirror.registerHelper("lint", "mgl", (text: string, opts: any, doc: any) =>
   try {
     parser.parse(text);
   }
-  catch (e) {
+  catch (_e) {
     // ignore errors
   }
 

src/libs/urlopen.ts

@@ -1,4 +1,3 @@
-// @ts-ignore
 import style from './style'
 
 export function initialStyleUrl() {