Fixed OSM layer loading and checkbox problem

[ananyaarun]

Fixes #139

• PR is descriptively titled 📑 and links the original issue above 🔗
• tests pass -- look for a green checkbox ✔️ a few minutes after opening your PR
• code is in uniquely-named feature branch and has no merge conflicts 📁
• screenshots/GIFs are attached 📎 in case of UI updation
• ask @publiclab/reviewers for help, in a comment below

Thanks!

[ananyaarun]

@sagarpreet-chadha

• I have removed the requirement of minZoom = 7 for the OSM layer
• The layer now loads (checkbox works) for all zoom values. At the same time it takes way to long to load for a full map but on zoom loads quickly as shown in the gif.
• I have also added a (zoom in ) like pressure contour layer to tell users that this layers works better on zoom

[ananyaarun]

I have resolved the conflicts , do take a look @sagarpreet-chadha . Thanks !! :)

[jainaman224]

@sagarpreet-chadha I think we can add dist/LeafletEnvironmentalLayers.js to .gitignore.

[sagarpreet-chadha]

Hey Aman , great idea 😄 . We though about this and we decided to maintain dist file, like in plots2 or mapknitter we donot want to use any command to build dist file . Agreed we can make a script which can automatically make dist file after npm install LEL is executed . We can open a separate issue for this . Thanks :)

[sagarpreet-chadha]

Hey @ananyaarun , i am merging this for now . But we have to tackle the lagging of map in full screen due to large parsing of data . Let'a open a new issue for this and we can take help from @jywarren over there . Thank you! Great 😄

[ananyaarun]

Sure, i'll open an issue for that. Thanks!!