Add suitable icons in `Preferences`

[pratyaksh1610]

What

Add suitable icons in Preferences.

Why/User story

Add suitable icons in Preferences for better UI.

Before

[gaurisharma1122]

Hi @teolemon , I want to work on this.

[dmdbilal]

Can I work on this issue ?

[memms]

I see the previous pull request for the issue was closed instead of merged. Is this issue still open to be worked on? If so, is there a requirement for icon choices (a drive with the SVG files per se)?

[its-me-abhishek]

@teolemon If possible, can you please assign this issue to me . I want to work on this.

• As I have noticed, another PR was closed as the OP had used png file format.
• I will be implementing the icons using the svg file format using either the free open-source Google Fonts icons / or any other icon pack as suggested.
• Another issue that I have observed from the above PRs is the inconsistency in the thickness of the icons. Will be looking forward for a set of equally formatted icons.

[its-me-abhishek]

@teolemon If possible, can you please assign this issue to me . I want to work on this.

• As I have noticed, another PR was closed as the OP had used png file format.
• I will be implementing the icons using the svg file format using either the free open-source Google Fonts icons / or any other icon pack as suggested.
• Another issue that I have observed from the above PRs is the inconsistency in the thickness of the icons. Will be looking forward for a set of equally formatted icons.

Following are the samples of the icons that we will be implementing: Theme

Preferred Energy Unit

Preferred Volume Unit

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