refactor: fix eslint warnings in .vue files

[sethidden]

Continued fixes of eslint, but this time in .vue files.

Turned out that a huge amount of .vue errors were in a file that contained some SVG tags.

AFter this PR, there are 30 errors left - most are about missing lang="ts"

[sethidden]

Added lang="ts" to some more components. There are 17 errors left. Most are lang="ts", but adding lang="ts" obviously makes that one error turn into seven.

[bartoszherba]

Is this still required? maybe add return value instead of suppressing linter.

[sethidden]

https://nuxtjs.org/docs/directory-structure/middleware/#named-middleware

Given the example above I don't think there's anything to return. If I add just return the linter will complain about "useless return"

[bartoszherba]

Suggested change

	// eslint-disable-next-line prefer-destructuring
	const page : CmsPage = this.page;
	const { page }: CmsPage = this;

[bartoszherba]

Anyway, there is something wrong with this type if you destruct the value, is the page really CmsPage?

[sethidden]

Avoided destructuring with type assertion by using a solution from nuxt/typescript (link in commit message)
f182734 (#1036)