[Feature] Move all the descriptions and tags to separate file to avoid redundancy

[Nishith-Savla]

Are you adding a new feature?

• YES
• NO

Are you enhancing the old feature?

• YES
• NO

Is your feature request related to a problem?

• YES
• NO

Describe your feature\enhancement.

Currently the list of endpoints shown on the index page has all the endpoints and their description hard coded which is duplicated in the particular function as well.
To avoid this, we can create a separate dict or a json file having all the project routes, tags, description and take values from there.

Can you add the feature by yourself?

• YES
• NO

Additional Information

I'm a GSSoC '23 Contributer.

After the refactoring, the function decorator would be something like this.

@app.get(CALCULATE_RETIREMENT_GOALS_ROUTE.name,
         tags=CALCULATE_RETIREMENT_GOALS_ROUTE.tags,
         description=CALCULATE_RETIREMENT_GOALS_ROUTE.description,
)

[ighoshsubho]

Sure go ahead @Nishith-Savla ;)

[ighoshsubho]

@Nishith-Savla is this done?

[Nishith-Savla]

Sorry @ighoshsubho. Didn't get time to work on this. Starting work now. Will get a PR ready in a week

[Nishith-Savla]

There are 3 functions for Calculating CAGR, should I remove one? If yes, which one?
Same for Future Value of Annuity (2 functions)
2 Functions for Profitability Index as well

[Nishith-Savla]

Another thing, from line 528, we are using hyphens instead of dashes. Do we want to keep it like that or make it consistent?

[github-actions]

👋 @Nishith-Savla This issue is closed.

[github-actions]

👋 @Nishith-Savla This issue is closed.