Remove coverpage to allow long sidebar

[jbsv]

Related to #236, here is an attempt to improve browsing the DELA doc page.

[coveralls]

Pull Request Test Coverage Report for Build 4105461650

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 99.283%

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Totals
Change from base Build 4017041211:	0.0%
Covered Lines:	14260
Relevant Lines:	14363

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💛 - Coveralls

[pierluca]

@jbsv how can I see the output ? 😅

[sonarcloud]

Kudos, SonarCloud Quality Gate passed!   

0 Bugs
0 Vulnerabilities
0 Security Hotspots
0 Code Smells

No Coverage information
0.0% Duplication

[jbsv]

@pierluca, from your local git copy of dela: docsify serve docs, which implies that you install docsify-cli on your machine

[pierluca]

are you sure about this in this PR ? 😅

[jbsv]

yes

[pierluca]

Okay, I've been able to run it. Thanks for the instructions.

Couple of points of feedback:

1. "General Purpose", "Code" and "Instructions" in the menu seem to be not clickable ? It's a bit unclear.
   If they're supposed to be headers, some vertical spacing might be helpful, but I'm not sure they're very helpful.
   If we just rename "Guideline" into "Code Guideline", the rest is self-explanatory.

EDIT: I just checked the original, and this change seems to make the navigation bar way uglier overalls.
I understand better the headers now.

2. The home page would stand to benefit from having the introduction text featured more prominently and the image way smaller, as right now (on my screen, at least) the home page provides 0 useful content and just one BIIIIIIIIG picture 😅

EDIT: It's also not clear why "introduction" and "Dela" would be separate pages, as the introduction is basically pointless to someone browsing the documentation, without going into "Dela".

3. The code guidelines might need (slight) updating if you want to drop the mod.go guideline.