[FEATURE] Indexed search - Search result page styling

[OlenaBulat]

Is your feature request related to a problem? Please describe.
A clear and understandable look of Search result page for users. By default at Indexed Search extension includes different unnecessary elements for users which should be hidden.

Describe the solution you'd like
The search result page includes elements that could be hidden:

• default header
• Advanced search link
• Rules
• Size/ Created/ Modifies/ Path

Elements that could be improved with styling:

• Search field
• Button
  Suggestion: search field and button to be displayed in 1 row and be bigger (height/width)
• All helper text should have correct translation according to site language (e.g. "Search for:", "Search for XX", "Displaying result xx to xx out of XX")
• Page pagination
  Suggestion: pagination might be aligned in 1 row without bullets with appropriate hover and active states.
  Also, Previous and Next links in pagination should be translated correctly according to site language.
• Placeholder text for the search field
• Indexed search icons also could be improved in styling

Additional context