chore: remove obsolete script definitions

[MikeMcC399]

Issue

package.json contains several script definitions which refer to script sources that no longer exist.

cypress-docker-images/package.json

Lines 10 to 14 in b952572

	"scripts": {
	"build": "node ./scripts/generate-config",
	"add:base": "node ./scripts/generate-base-image",
	"add:browser": "node ./scripts/generate-browser-image",
	"add:included": "node ./scripts/generate-included-image",

• The script sources were removed as part of PR Introduce the cypress/factory image #812

Change

Remove the following obsolete script definitions from package.json:

• build
• add:base
• add:browser
• add:included

[cypress-app-bot]

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