* rework search form as grid layout
* remove various paddings and margins
* add logo and link to index to search form
* make categories bigger on phone
This fix was autogenerated by::
npx stylelint -f unix --fix 'searx/static/themes/simple/src/less/**/*.less'
Signed-off-by: Markus Heiser <markus.heiser@darmarit.de>