[TASK] Remove typo3/.htaccess

The current solution caused a lot of troubles with server configuration.
To avoid any nasty workarounds we simply create a real entry point again.

Resolves: #78645
Releases: master, 7.6
Change-Id: I9003ffe8308290a145fe36a1e9ff884016ea0523
Reviewed-on: https://review.typo3.org/50582


Tested-by: TYPO3com <no-reply@typo3.com>
Reviewed-by: Andreas Kiessling <andreas.kiessling@web.de>
Tested-by: Andreas Kiessling <andreas.kiessling@web.de>
Reviewed-by: Alexander Opitz <opitz.alexander@googlemail.com>
Tested-by: Alexander Opitz <opitz.alexander@googlemail.com>
Reviewed-by: Nicole Cordes <typo3@cordes.co>
Tested-by: Nicole Cordes <typo3@cordes.co>
Reviewed-by: Markus Klein <markus.klein@typo3.org>
Tested-by: Markus Klein <markus.klein@typo3.org>