Add events/* pages

## Events listing
Route: `/events/`

Structure with examples:
### Ongoing
Date | Title | Description | Announcements & Interim reports
--- | --- | --- | ---
since 2019-03-01 | [Frontend p2p](https://github.com/kottans/frontend) | peer-to-peer Front End course | [fb](./xx), [twitter](./xx), [tg](./xx), [dou](./xx), [ain](./xx), [youtube](./xx), [Meetup 2019-04-25](./xxx)
since 2019-09-20 | [Backend](./events/backend) | NodeJS / Go / Python [backend course](https://github.com/kottans/backend) online phase | [fb](./xx), [twitter](./xx), [tg](./xx), [dou](./xx), [ain](./xx), [youtube](./xx), [Meetup 2019-04-25](./xxx)

### Upcoming
Date | Title | Description | Announcements
--- | --- | --- | ---
2020-02-01 - 2020-04-01 | [YDKJS](./events/ydkjs) | Walking through some of the [You Don't Know JS](https://github.com/getify/You-Dont-Know-JS) topics | [fb](./xx), [twitter](./xx), [tg](./xx), [dou](./xx), [ain](./xx), [youtube](./xx)

### Past
Date | Title | Description | Reports
--- | --- | --- | ---
2020-01-25 | [Git Workshop](./events/git-workshop) | Mastering `rebase` and team collaboration. Based on [git course](https://github.com/kottans/git-course) | [fb](./xx), [twitter](./xx), [tg](./xx), [dou](./xx), [ain](./xx), [youtube](./xx)
2019-12-10 | [Clojure Day Conference](./events/clojure-day) | Lisp foreva | [fb](./xx), [twitter](./xx), [tg](./xx), [dou](./xx), [ain](./xx), [youtube](./xx)
2019-09-14 | [Git Workshop](./events/git-workshop) | Mastering `rebase` and team collaboration. Based on [git course](https://github.com/kottans/git-course) | [fb](./xx), [twitter](./xx), [tg](./xx), [dou](./xx), [ain](./xx), [youtube](./xx)
2019-05-20 | [INPUT Conference](https://inputconf.org/) | A conference for switchers and junior devs: boosting your career | [fb](./xx), [twitter](./xx), [tg](./xx), [dou](./xx), [ain](./xx), [youtube playlist](./xx)
2018-10-01 - 2019-06-15 | [Front End](https://github.com/kottans/frontend) | A Front End course for beginners: HTML, CSS, Javascript, intro to Frameworks | [fb](./xx), [twitter](./xx), [tg](./xx), [dou](./xx), [ain](./xx), [youtube playlist](./xx)
2017-10-01 - 2018-05-30 | [Front End](https://github.com/kottans/frontend) | A Front End course for beginners: HTML, CSS, Javascript, intro to Frameworks | [fb](./xx), [twitter](./xx), [tg](./xx), [dou](./xx), [ain](./xx), [youtube playlist](./xx)

etc back to yr 2012...

---

## Event page
Route: `/events/`

Structure:
- Title
- Cover image (also used for socials)
- Date/time
- Location
- Verbose Description (also used for announcement on socials)
- Topics
- Admission requirements
- Link to related repos if any
- Media from similar past events
- Navigation
- Registration form / link | Tickets

Navigation is a partial from a pre-defined set. Each partial comprises Street-view image, Map crop, Link to a google-map location, Address. Those partials are re-used

---

## General notes

The deployment of a new event page must be as easy and quick as possible. Shouldn't employ styling and code review effort. Copy+change strategy expected.

Start from the existing site structure and the requested /events/ and /events/ routes. Compare the proposed listing tables, event-page fields, reusable navigation partials, and copy-and-change deployment requirement with the repository's current pages. Done means ongoing, upcoming, and past events plus reusable event pages can be added without new styling or substantial review work.

Written by the indexing model from the issue text.