fix(icons): Added missing icons

[robert1508]

Added the following missing icons:

• Added calendar plus solid icon
• Added bell-active-alt solid icon
• Added cloud-arrow-up solid icon
• Added file check solid icon
• Added keyboard outline icon
• Added arrow-down outline icon
• Added calendar-plus outline icon

Renamed the following icons:

• Renamed "adjustments-vertical.svg" to "briefcase.svg"

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