Closes #83

- add podcast sidebar navigation
- add podcast dashboard with latest episodes
- add pagination to podcast episodes
- add components helper to reuse ui components (button, data_table, etc.)
- enhance podcast and episode forms by splitting them into form sections
- add hint tooltips to podcast and episode forms
- transform radio inputs as buttons for better ux
- replace explicit field by parental_advisory
- replace author field by publisher
- add podcasts_categories table to set multiple categories
- use choices.js to enhance multiselect fields
- update Language files
- update js dependencies to latest versions

closes #31, #9

- adapt wireframes with responsive design
- refactor models methods to cache requests for faster queries
- update public controllers to cache pages while retaining analytics hits
- add platform links to podcast page
- add previous / next episodes in episode page
- update npm packages to latest versions

closes #30, #13

- fixes error when running castopod on php<7.4

fixes #23

- add Breadcrumb library and service
- update authorizations
- add missing routes to avoid 404 links in breadcrumb
- add svg_helper globally in base controller
- update purgecss config to check .ts files

closes #17

- add .editorconfig file
- format all files to comply with castopod's coding style
- switch parsedown dependency with commonmark library to better follow commonmark spec for markdown
- add prettier command to format all project files at once

closes #16

- update myth-auth and codeigniter to latest develop changes
- improve permission check: remove all
dynamic permissions per podcast and overwrite myth-auth services and permission filter
- remove
unnecessary code because of myth-auth upgrade
- refactor some controller code for better clarity
-
add remaining seeders in docs

closes #19, #20