feat: make disabled text fields appear grey on profile page

[bharat-1809]

Description

Added an opacity widget that sets the opacity of the page to 50% when editing is disabled and changes to 100% when editing is enabled.

Fixes #84

Flutter Channel:

• I have used the Flutter Beta channel on my local machine

Type of Change:

Delete irrelevant options.

• Code

Code/Quality Assurance Only

• New feature (non-breaking change which adds functionality pre-approved by mentors)

How Has This Been Tested?

Physical device.
Steps:

• Go to the profile page by selecting it from bottom bar
• Click on the Floating Action Button to start editing and see the changes

Checklist:

• My PR follows the style guidelines of this project
• I have performed a self-review of my own code or materials
• I have commented on my code or provided relevant documentation, particularly in hard-to-understand areas

Code/Quality Assurance Only

• My changes generate no new warnings
• My PR currently breaks something (fix or feature that would cause existing functionality to not work as expected)
• Any dependent changes have been published in downstream modules

[bartekpacia]

Looks cool! It'd be even nicer if you added some simple animation to it, what do you think @bharat-1809?

[techno-disaster]

Looks cool! It'd be even nicer if you added some simple animation to it, what do you think @bharat-1809?

@bartekpacia what kind of animation are we talking about? because we already have #83 which adds loading indicators.

[bartekpacia]

Sorry for not specifying; I mean fading the opacity.

[bharat-1809]

@bartekpacia sure, I'll start working on it :)

[bartekpacia]

Thank you, it'll look and feel better this way:)

PS If you don't feel like doing it, just write, I'll accept this because it's already great work.

[bharat-1809]

@bartekpacia Thanks ☺, I have no problem in doing it and would love to contribute :))
Thanks again.

[techno-disaster]

Hey, @bharat-1809 any updates?

[bharat-1809]

@techno-disaster Sorry for the delay, I will make the changes surely by tonight.

[bharat-1809]

I have added the fading animation. Please have a look and suggest any changes if required.
Thanks :)

[bartekpacia]

This looks great, thank you!:D

[robotjellyzone]

I have reviwed & tested this PR , and its working fine as it should 👍 .

[isabelcosta]

@techno-disaster can you please review and approve if you feel it should be.

[techno-disaster]

LGTM, goof work :)