Remove function-calc-no-invalid (#5296)

* Remove function-calc-no-invalid

* Remove calc parser

* Remove ignoring of calc parser

.eslintignore

@@ -1,6 +1,5 @@
 .coverage
 lib/vendor
-lib/utils/parseCalcExpression/parser.js
 
 # Unignore config files like .prettierrc.js, because they're ignored by default
 !.*rc.js

.prettierignore

@@ -10,7 +10,6 @@
 **/fixtures/**/*.vue
 **/fixtures/**/*.html
 **/fixtures/**/*.markdown
-lib/utils/parseCalcExpression/parser.js
 scripts/**/*.css
 system-tests/**/*.css
 system-tests/**/*.scss

docs/user-guide/rules/list.md

@@ -23,7 +23,6 @@ Grouped first by the following categories and then by the [_thing_](http://apps.
 
 ### Function
 
-- [`function-calc-no-invalid`](../../../lib/rules/function-calc-no-invalid/README.md): Disallow an invalid expression within `calc` functions.
 - [`function-calc-no-unspaced-operator`](../../../lib/rules/function-calc-no-unspaced-operator/README.md): Disallow an unspaced operator within `calc` functions.
 - [`function-linear-gradient-no-nonstandard-direction`](../../../lib/rules/function-linear-gradient-no-nonstandard-direction/README.md): Disallow direction values in `linear-gradient()` calls that are not valid according to the [standard syntax](https://developer.mozilla.org/en-US/docs/Web/CSS/linear-gradient#Syntax).