Also grouped custom input elements

Resolve "Redigerings tillatelse"

Closes #12

See merge request !20

Added simple navbar styling
Navbar uses routing instead of href

Resolve "Legg til password-input som shared component i frontend" and "Legg til /logout route i frontend"

Closes #25 and #24

See merge request !17

feat: add css design on app homepage (#26)

Closes #26

See merge request !18

Issue: Filter by category and test fixes (#27)

Closes #27

See merge request !19

# Conflicts:
#   client/src/app/authentication/auth.service.ts

Refactor: lagt til kommentarer der det er nødvendig i frontend

Closes #23

See merge request !16

Resolve "Flytte endepunkter av bruker registrering og login til sin egen kontroller `authenticationController`"

Closes #22

See merge request !14

Resolve "Logge inn / bruker autentisering - både Frontend og Backend"

Closes #9

See merge request !13

Resolve "Frontend: Bruker form"

Closes #8

See merge request !12

# Conflicts:
#   server/src/controllers/postController/index.ts

# Conflicts:
#   server/src/controllers/postController/index.ts

Resolve "Redigere annonse"

Closes #11

See merge request !15

Co-authored-by: Shirajuki <jonnynl@stud.ntnu.no>

Resolve "Organiser/Filtrere funksjon etter kategori"

Closes #6

See merge request !9

Merge branch '6-organiser-filtrere-funksjon-etter-kategori' of https://gitlab.stud.idi.ntnu.no/tdt4140-group-58/spring2021-sellpoint into 6-organiser-filtrere-funksjon-etter-kategori