[TASK] Use signal slot for appending Page TSConfig

https://forge.typo3.org/issues/59712 introduces a signal slot that
can be used to append the theme TSConfig to the Page TSConfig.
Merge pull request #22 from Shade634/cleanup

[CLEANUP] Add todo for missing docblock and tabs
[TASK] page = PAGE
Merge branch 'tsconfig_signal_slot'
Merge branch 'astehlik-tsconfig_signal_slot'
[TASK] Make PageTS work again
[TASK] Adopt to better signal slot implementation
Update Index.rst

typos, wording, ...
Merge pull request #23 from rslg/patch-1

Update Index.rst
Generated ext_emconf.php ? #24
Merge pull request #27 from Shade634/cleanup

[CLEANUP] Fixed some wrong spelled names
ConstantsViewHelper Cache
LanguageViewHelper fixed
[TASK] Fix unit tests and update Database ...
[CLEANUP] Some small indenting fixes