[openstreetmap/openstreetmap-website] Rework various warnings (#2711)

[Andy Allan]

This work is based on the ideas from #1773 but with bootstrap alerts.

Pictures tell a thousand words:

### 1 New Notes

![Screenshot from 2020-07-15 15-28-47](https://user-images.githubusercontent.com/360803/87576378-96483300-c6d1-11ea-99d7-316418d1e5c1.png)

### 2 Note Anonymous warning

![Screenshot from 2020-07-15 19-27-09](https://user-images.githubusercontent.com/360803/87576426-ac55f380-c6d1-11ea-85ad-a7bab7479e26.png)

### 3 Export too large

![Screenshot from 2020-07-15 15-37-31](https://user-images.githubusercontent.com/360803/87576459-b841b580-c6d1-11ea-9a3e-ec2eaf62b99a.png)

### 4 Data browser too many features

![Screenshot from 2020-07-15 16-10-29](https://user-images.githubusercontent.com/360803/87576501-ca235880-c6d1-11ea-94e8-6cf92e5d13da.png)

The last of these took some rearranging of the jquery-crafted html, so I can rework that bit if necessary. But other than that I think they are much better than the merely indented paragraphs that we had before.



You can view, comment on, or merge this pull request online at:

  https://github.com/openstreetmap/openstreetmap-website/pull/2711

-- Commit Summary --

  * Convert warnings to use bootstrap alerts
  * Convert data feature warning to use bootstrap alert
  * Remove unused warning css

-- File Changes --

    M app/assets/javascripts/index/browse.js (21)
    M app/assets/stylesheets/common.scss (9)
    M app/views/browse/new_note.html.erb (2)
    M app/views/browse/note.html.erb (7)
    M app/views/site/export.html.erb (2)

-- Patch Links --

https://github.com/openstreetmap/openstreetmap-website/pull/2711.patch
https://github.com/openstreetmap/openstreetmap-website/pull/2711.diff

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