Fix expression full width

No more "Expression could not be parsed" errors. Changes:

• cd.navigation.horizContNav.pidList and cd.fullWidth.pidList are lists of integers (surrounded with square brackets)
• conditions for both variables are replaced with page["pid"] in {$...}`

This is a breaking change: if the condition is left as <number> in tree.rootLineIds then TypoScript fails with an error. On the other hand, this approach is matches the names of the variables.

requested review from @bbaer

assigned to @bbaer

The documentation must be updated if the merge request is accepted.

added 3 commits

• 9cac3a91 - fullWidth and navigation.horizContNav with pidList and pidCond
• 010e8413 - Moved template_login from Public to Private
• a9e3350f - Updated documentation

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added 1 commit

• 9523418b - Updated configuration snippets in README.md

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