BS5: dark theme fixes 1

[Aniket-Engg]

Following points are fixed from #6230

• Change default font from Lato to Nunito Sans
• Fix remix logo color :
• Primary button label and icon should be --bs-body-bg : #222336
• the currently selected tab should appear highlighted, same color as the code editor background
• Tooltip backgorund should be --bs-body-bg : #222336
• Dropdown border color should be --bs-border-color: #3f4455
• in the script confirguration panel, we lost the different layers colors
• The template panel cards doesn't follow the right border style

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[joeizang]

Script Runner config tab sometimes has a strange color and the logo color isn't the right one. See the image below:

• The border above the terminal is the wrong type of gray.
• Text in the template explorer in not the correct size. See the Image below:
  This is on live

Just for comparison, here is the current image with BS 5:

• There should be some margins at the top and bottom of the search of the terminal. See Image:

• Some elements in template explorer are completely misaligned. See image:

• Text of our buttons are of different colors which isn't right. See image:

• I am not sure about the dark text on a light button as it isn't consistent with our button text in the ide.