Make navbar more mobile friendly

[lucperkins]

Motivation

At the moment, the website's navbar has a variety of UX problems on mobile, including sizing, overflow, and other issues.

Modifications

I've removed some CSS styling that either wasn't necessary or created a broken experience.

Result

The navbar will provide an experience more in line with what users will expect. Not perfect but I think a major improvement.

[merlimat]

👍

[merlimat]

retest this please

[lucperkins]

@merlimat I'm getting this (non-website-related) error in CI:

[ERROR] Tests run: 542, Failures: 1, Errors: 0, Skipped: 0, Time elapsed: 1,225.036 s <<< FAILURE! - in TestSuite
[ERROR] socketTest(org.apache.pulsar.websocket.proxy.ProxyPublishConsumeTest)  Time elapsed: 0.198 s  <<< FAILURE!
java.lang.AssertionError: null: lists don't have the same size expected [6] but found [10]
	at org.apache.pulsar.websocket.proxy.ProxyPublishConsumeTest.socketTest(ProxyPublishConsumeTest.java:160)

[INFO] 
[INFO] Results:
[INFO] 
[ERROR] Failures: 
[ERROR]   ProxyPublishConsumeTest.socketTest:160 null: lists don't have the same size expected [6] but found [10]
[INFO] 
[ERROR] Tests run: 542, Failures: 1, Errors: 0, Skipped: 0
[INFO] 
[ERROR] There are test failures.

Should I submit an issue?

[merlimat]

Should I submit an issue?

There's already an issue open for that flaky test, though is not easy to replicate in local env.

[merlimat]

retest this please