consistent naming for path and url strings

[rojin254]

Description

Changed the url strings in get_static_url method and get_base_url method to have a trailing "/" ( static/ instead of /static) to make it consistent with other url and path returning methods

Related to issue #469

Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas

[pieroit]

Thanks and welcome @rojin254
Why don't you jump in the discord