[openstreetmap/openstreetmap-website] Overhaul markers (PR #5764)

[Marwin Hochfelsner]

### Description

- Makes all[^1] markers SVGs with a similar structure. (addresses https://github.com/openstreetmap/openstreetmap-website/issues/850#issuecomment-2323133938)
- Adds marker variants for routing (addresses https://github.com/openstreetmap/openstreetmap-website/issues/929#issuecomment-78864019)
- Changes the note markers' ✔️, ❌ & ➕ to be drawn with a reused stroke instead of areas to reduce file size. It also renames them so all marker files start with _marker_.
- Continues to use marker-shadow.png from leaflet

![image](https://github.com/user-attachments/assets/f8a7929f-ba2e-4e55-8476-faf8a7feeff9)
![image](https://github.com/user-attachments/assets/b9077af8-bda6-4ad8-81b9-566dc6fea74c)

[^1]: not the yellow marker as I don't have the colours for that one
You can view, comment on, or merge this pull request online at:

  https://github.com/openstreetmap/openstreetmap-website/pull/5764

-- Commit Summary --

  * Name markers uniformly
  * Overhaul markers

-- File Changes --

    M app/assets/config/manifest.js (2)
    D app/assets/images/closed_note_marker.svg (19)
    D app/assets/images/marker-blue.png (0)
    A app/assets/images/marker-blue.svg (20)
    A app/assets/images/marker-from.svg (20)
    D app/assets/images/marker-green.png (0)
    A app/assets/images/marker-green.svg (20)
    A app/assets/images/marker-note-closed.svg (20)
    A app/assets/images/marker-note-new.svg (20)
    A app/assets/images/marker-note-open.svg (20)
    D app/assets/images/marker-red.png (0)
    A app/assets/images/marker-red.svg (20)
    A app/assets/images/marker-to.svg (20)
    D app/assets/images/new_note_marker.svg (15)
    D app/assets/images/open_note_marker.svg (19)
    M app/assets/javascripts/embed.js.erb (4)
    M app/assets/javascripts/index/directions.js (4)
    M app/assets/javascripts/index/layers/notes.js (6)
    M app/assets/javascripts/index/new_note.js (6)
    M app/assets/javascripts/index/note.js (6)
    M app/assets/javascripts/leaflet.map.js (4)
    M app/assets/javascripts/osm.js.erb (18)
    M app/views/dashboards/_contact.html.erb (2)
    M app/views/dashboards/show.html.erb (2)
    M app/views/layouts/_search.html.erb (4)
    M app/views/notes/index.html.erb (4)

-- Patch Links --

https://github.com/openstreetmap/openstreetmap-website/pull/5764.patch
https://github.com/openstreetmap/openstreetmap-website/pull/5764.diff

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