Initial draft for Open Research Webinars #1

Created by: flora8984461

----------------------- Updated on Nov 12 ------------------------------- revision history 0.4

------------------------ Updated on Nov 11 ----------------------------- revision history 0.3

Replace right nav with logo (Not sure should I also remove toolbar?)
Adjust Homepage upcoming events block (Can someone provide me design and color theme for homepage?)
Updated all button's default color
Updated speaker's bg
Modified the shortcode for past events to hide past events when no one

------------------------ Updated on Nov 10 ----------------------------- revision history 0.2

Updated header img, header text, header button, one header logo, including header text font-weight
Add "CET" to Series Launch: Tuesday, December 15, 2020, 16:00-17:00 CET
Hide a dash after h1
Updated "About Us" text
Add end_text in registeration.yml
Also update header bg at homepage and code-of-conduct

------------------------ Updated on Nov 09 ----------------------------- revision history 0.1

TODO list for me:

header
- title()
- subtitle()
- Tagline()
- Important links( - register)
Registration (About the Event)
- About content ()
- Important links ( what's the registeration link? )
- End Date ()
- End text
Speakers / Program Committee
- User_display on front page with one speaker ()
- Program Committee?
- A page to display all speakers and User_display will hook to the person you clicked on?
Agenda
- default fake content created ()
- Does session Information need?
Sponsors
- Co-organizers( - copied from SAM IoT)
Webinar Series (use the homepage)
- draft similar to jakartaOne, with upcoming events block and past events block (for now the content is empty) ()
- More design...
Fix no spacing in registeration link button on mobile view (merged by https://github.com/EclipseFdn/solstice-assets/commit/5a0a5b7dd4a91a9f7130bada635dd128db04e8fc)