Empty branch IDs and missing payment information caused network errors
and a missing billing component.

Includes the associated Go functions for inserting and selecting given a
specific user ID or subscription ID. Also adds required HTML tags and
HTTP queries for subscription process during user registration.

At most one result should exist for each loan stored but not redeclaring
the 'estimate' variable within the seed loop caused the loan entries of
the first estimate to be copied onto the second, which caused an error
while seeding result entries.

Also seperate stages of seeding into other functions.

Update the database tables for user and branch to give more information
required for PDF generation. Also set up a test component to preview
change to the view during development. It will be reconfigured once the
genrated PDF is satisfactory.

Null makes missing values harder to convert to json using the Scan
operation. 0 and '' will be used instead to be type consistent.

Setup structs for storing query information.

Also change the favicon to better match the colorscheme. An additional
section is added to settings.vue to mock the new fields.